What Is an Atom?

Answer 1

It used to be the smallest thing in the universe. Its whath mater is compound of. It contains many kind of particles like protons , electrons and neutrons.

Answer 2

In chemistry and physics, an atom (Greek ἄτομος or átomos meaning "indivisible") is the smallest particle still characterizing a chemical element.[2] (átomos is usually translated as "indivisible" or "uncuttable." Until the advent of quantum mechanics, dividing a material object was invariably equated with cutting it.) Whereas the word atom originally denoted a particle that cannot be cut into smaller particles, the atoms of modern parlance are composed of subatomic particles:

- electrons, which have a negative charge, a size which is so small as to be currently unmeasurable, and which are the least heavy (i.e., massive) of the three;
- protons, which have a positive charge, and are about 1836 times more massive than electrons; and
- neutrons, which have no charge, and are about 1838 times more massive than electrons.
Protons and neutrons make up a dense, massive atomic nucleus, and are collectively called nucleons. The electrons form the much larger electron cloud surrounding the nucleus.

Atoms can differ in the number of each of the subatomic particles they contain. Atoms of the same element have the same number of protons (called the atomic number). Within a single element, the number of neutrons may vary, determining the isotope of that element. The number of electrons associated with an atom is most easily changed, due to the lower energy of binding of electrons. The number of protons (and neutrons) in the atomic nucleus may also change, via nuclear fusion, nuclear fission or radioactive decay, in which case the atom is no longer the same element it was.

Atoms are electrically neutral if they have an equal number of protons and electrons. Atoms which have either a deficit or a surplus of electrons are called ions. Electrons that are furthest from the nucleus may be transferred to other nearby atoms or shared between atoms. By this mechanism atoms are able to bond into molecules and other types of chemical compounds like ionic and covalent network crystals.

Atoms are the fundamental building blocks of chemistry, and are conserved in chemical reactions.

Answer 3

In chemistry and physics, an atom (Greek ἄτομος or átomos meaning "indivisible") is the smallest particle still characterizing a chemical element.[2] (átomos is usually translated as "indivisible" or "uncuttable." Until the advent of quantum mechanics, dividing a material object was invariably equated with cutting it.) Whereas the word atom originally denoted a particle that cannot be cut into smaller particles, the atoms of modern parlance are composed of subatomic particles:

electrons, which have a negative charge, a size which is so small as to be currently unmeasurable, and which are the least heavy (i.e., massive) of the three;
protons, which have a positive charge, and are about 1836 times more massive than electrons; and
neutrons, which have no charge, and are about 1838 times more massive than electrons.
Protons and neutrons make up a dense, massive atomic nucleus, and are collectively called nucleons. The electrons form the much larger electron cloud surrounding the nucleus.

Atoms can differ in the number of each of the subatomic particles they contain. Atoms of the same element have the same number of protons (called the atomic number). Within a single element, the number of neutrons may vary, determining the isotope of that element. The number of electrons associated with an atom is most easily changed, due to the lower energy of binding of electrons. The number of protons (and neutrons) in the atomic nucleus may also change, via nuclear fusion, nuclear fission or radioactive decay, in which case the atom is no longer the same element it was.

Atoms are electrically neutral if they have an equal number of protons and electrons. Atoms which have either a deficit or a surplus of electrons are called ions. Electrons that are furthest from the nucleus may be transferred to other nearby atoms or shared between atoms. By this mechanism atoms are able to bond into molecules and other types of chemical compounds like ionic and covalent network crystals.

Atoms are the fundamental building blocks of chemistry, and are conserved in chemical reactions

Answer 4

In chemistry and physics, an atom (Greek átomos meaning "indivisible") is the smallest particle still characterizing a chemical element. (átomos is usually translated as "indivisible" or "uncuttable." Until the advent of quantum mechanics, dividing a material object was invariably equated with cutting it.) Whereas the word atom originally denoted a particle that cannot be cut into smaller particles, the atoms of modern parlance are composed of subatomic particles:

* electrons, which have a negative charge, a size which is so small as to be currently unmeasurable, and which are the least heavy (i.e., massive) of the three;
* protons, which have a positive charge, and are about 1836 times more massive than electrons; and
* neutrons, which have no charge, and are about 1838 times more massive than electrons.

Protons and neutrons make up a dense, massive atomic nucleus, and are collectively called nucleons. The electrons form the much larger electron cloud surrounding the nucleus.

The atomic number originally meant the number of an element's place in the periodic table. Dmitri Mendeleev arranged the known elements in increasing order of atomic mass and grouped by their similar chemical properties. However, placing the elements in strict order of atomic mass resulted in some mismatches. Iodine and tellurium, if listed by atomic mass, appeared to be in the wrong order; and would fit better by chemical properties if their places in the table were swapped. Placing them in the order which fit their properties most closely, their number in the table was their atomic number. This number appeared to be related to the mass of the atom but, as the discrepancy showed, reflected some property other than mass.

Answer 5

Atom
Helium atom ground state
A depiction of the atomic structure of the helium atom. The darkness of the electron cloud corresponds to the line-of-sight integral over the probability function of the 1s electron orbital. The magnified nucleus is schematic, showing protons in pink and neutrons in purple. In reality, the nucleus (and the wavefunction of each of the nucleons) is also spherically symmetric. (For more complex nuclei this is not the case.)
Classification
Smallest recognised division of a chemical element
Properties
Mass : ≈ 1.67 × 10-27 to 4.52 × 10-25 kg
Electric charge : zero(if the number of electrons equal of protons in an atom)
Diameter : (data page) 50 pm(H) to 520 pm(Cs)
Number of atoms in the observable universe: ~1080 [1]

In chemistry and physics, an atom (Greek ἄτομος or átomos meaning "indivisible") is the smallest particle still characterizing a chemical element.[2] (átomos is usually translated as "indivisible" or "uncuttable." Until the advent of quantum mechanics, dividing a material object was invariably equated with cutting it.) Whereas the word atom originally denoted a particle that cannot be cut into smaller particles, the atoms of modern parlance are composed of subatomic particles:

* electrons, which have a negative charge, a size which is so small as to be currently unmeasurable, and which are the least heavy (i.e., massive) of the three;
* protons, which have a positive charge, and are about 1836 times more massive than electrons; and
* neutrons, which have no charge, and are about 1838 times more massive than electrons.

Protons and neutrons make up a dense, massive atomic nucleus, and are collectively called nucleons. The electrons form the much larger electron cloud surrounding the nucleus.

Atoms can differ in the number of each of the subatomic particles they contain. Atoms of the same element have the same number of protons (called the atomic number). Within a single element, the number of neutrons may vary, determining the isotope of that element. The number of electrons associated with an atom is most easily changed, due to the lower energy of binding of electrons. The number of protons (and neutrons) in the atomic nucleus may also change, via nuclear fusion, nuclear fission or radioactive decay, in which case the atom is no longer the same element it was.

Atoms are electrically neutral if they have an equal number of protons and electrons. Atoms which have either a deficit or a surplus of electrons are called ions. Electrons that are furthest from the nucleus may be transferred to other nearby atoms or shared between atoms. By this mechanism atoms are able to bond into molecules and other types of chemical compounds like ionic and covalent network crystals.

Atoms are the fundamental building blocks of chemistry, and are conserved in chemical reactions.

Answer 6

an atom is the smallest particle of an element or of a compound which shows all the properties of that element/compound . It does not has any independent existence . An atom is made up of electrons and nucleons(protons and neurtons present in the nucleus of an atom) . The electrons are revolving around the nucleus in energy levels or shells . The no. of electrons in an energy level is given by the formula 2Nsq. , where "N" is the no. of energy level or shell.

Answer 7

All matter consists of particles called atoms. This is a list of the basic characteristics of atoms:

* Atoms cannot be divided using chemicals. They do consist of parts, which include protons, neutrons, and electrons, but an atom is a basic chemical building block of matter.

* Each electron has a negative electrical charge.

* Each proton has a positive electrical charge. The charge of a proton and an electron are equal in magnitude, yet opposite in sign. Electrons and protons are electrically attracted to each other.

* Each neutron is electrically neutral. In other words, neutrons do not have a charge and are not electrically attracted to either electrons or protons.

* Protons and neutrons are about the same size as each other and are much larger than electrons.

* The mass of a proton is essentially the same as that of a neutron. The mass of a proton is 1840 times greater than the mass of an electron.

* The nucleus of an atom contains protons and neutrons. The nucleus carries a positive electrical charge.

* Electrons move around outside the nucleus.

* Almost all of the mass of an atom is in its nucleus; almost all of the volume of an atom is occupied by electrons.

* The number of protons (also known as its atomic number) determines the element. Varying the number of neutrons results in isotopes. Varying the number of electrons results in ions. Isotopes and ions of an atom with a constant number of protons are all variations of a single element.

* The particles within an atom are bound together by powerful forces. In general, electrons are easier to add or remove from an atom than a proton or neutron. Chemical reactions largely involve atoms or groups of atoms and the interactions between their electrons..

Answer 8

An atom is the smallest particle of which the matter is made of. It contains electrons with negative equal in number, revolving round its nucleus composed of neutrons and protons with positive charge. Atom can be broken into smaller elements when it is bombarded with neutrons which releases a lot of energy setting up a thermo-nuclear reaction which is atom bomb. When controlled thermonuclear reaction is undertaken in a reactor, power is generated for peaceful uses.

Answer 9

atoms are the smallest particles present ina substance. some atoms have the capcity to be independent while others combine to form molecules. atoms are mainly formed of electrons[-ve charge],protons[+ve charge], and neutrons[neutral].the electrons revolve around the neucleus in fixed orbit called shells. the atoms share electrons during a chemical reaction.protons and neutrons constitutes the major % of the mass and are inside the nucleus.
these subdivisons were discovered by scientists like E.goldstein . the structure iof atom was stated by neil bhor

Answer 10

The name Atom applies to a pair of related standards. The Atom Syndication Format is an XML language used for web feeds, while the Atom Publishing Protocol (APP for short) is a simple HTTP-based protocol for creating and updating Web resources.

Web feeds allow software programs to check for updates published on a web site. To provide a web feed, a site owner may use specialized software (such as a content management system) that publishes a list (or "feed") of recent articles or content in a standardized, machine-readable format. The feed can then be downloaded by web sites that syndicate content from the feed, or by feed reader programs that allow Internet users to subscribe to feeds and view their content.

A feed contains entries, which may be headlines, full-text articles, excerpts, summaries, and/or links to content on a web site, along with various metadata.

The development of Atom was motivated by the existence of many incompatible versions of the RSS syndication format, all of which had shortcomings, and the poor interoperability [1] of XML-RPC-based publishing protocols. The Atom syndication format was published as an IETF "proposed standard" in RFC 4287. The Atom Publishing Protocol is still in draft form

Answer 11

The name Atom applies to a pair of related standards. The Atom Syndication Format is an XML language used for web feeds, while the Atom Publishing Protocol (APP for short) is a simple HTTP-based protocol for creating and updating Web resources.

Web feeds allow software programs to check for updates published on a web site. To provide a web feed, a site owner may use specialized software (such as a content management system) that publishes a list (or "feed") of recent articles or content in a standardized, machine-readable format. The feed can then be downloaded by web sites that syndicate content from the feed, or by feed reader programs that allow Internet users to subscribe to feeds and view their content.

A feed contains entries, which may be headlines, full-text articles, excerpts, summaries, and/or links to content on a web site, along with various metadata.

The development of Atom was motivated by the existence of many incompatible versions of the RSS syndication format, all of which had shortcomings, and the poor interoperability [1] of XML-RPC-based publishing protocols. The Atom syndication format was published as an IETF "proposed standard" in RFC 4287. The Atom Publishing Protocol is still in draft form.Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you.

Atoms are composed of particles called protons, electrons and neutrons. Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus. A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons.

Protons and neutrons are both composed of other particles called quarks and gluons. Protons contain two 'up' quarks and one 'down' quark while neutrons contain one 'up' quark and two 'down' quarks. The gluons are responsible for binding the quarks to one another.
Matter is composed of atoms. This is a consequence of the manner in which the electrons are distributed throughout space in the attractive field exerted by the nuclei. The nuclei act as point attractors immersed in a cloud of negative charge, the electron density (r). The electron density describes the manner in which the electronic charge is distributed throughout real space. The electron density is a measurable property and it determines the appearance and form of matter.

The atom is the fundamental building block of all stuff, or what scientists like to call "matter". An individual atom is very small. In fact, the smallest type of atom, hydrogen, has a diameter of 10-8 cm. This means that if the hydrogen atom was the size of a soccer ball, then a soccer ball would be 6450 kilometers (4008 miles) high. Every single object is composed of atoms. Your body is made up of many, many individual atoms. There are also many different types of atoms. In fact, there are over a 100. These different types are called elements. Examples of some elements are hydrogen, oxygen, iron, copper, and helium. Under normal conditions many atoms can stick together to form larger, different stuff. Scientists call material that results from the joining of different types of atoms "compounds". An example of a compound is water, which is a group of two hydrogen atoms and one oxygen atom. Notice that we said that these types of compounds can only form under what we called "normal conditions". In the type of environment in which nuclear fusion occurs, the joining of atoms, also known as bonding, can't happen.


Atoms are mostly empty space, but in the center of the atom is a structure called a nucleus. The nucleus is a congregation of particles. These particles are called protons and neutrons. Neutrons are neutral, or have no electrical charge. Protons, however, carry a positive electrical charge of 1. So, in a carbon atom, which has 6 protons in its nucleus, the overall electric charge of the nucleus would be 6. However, a regular atom is electrically neutral. This is because swirling around the nucleus in what is called the "electron cloud". The electrons in the electron cloud counteract the positive charges of the protons in the atomic nucleus with their negative electrical charges. This generates the neutral charge of the atom. The number of electrons and number of protons correlate in a one to one ratio.This means that there are the same number of protons and electrons in one atom.