what is atomic no & what is mass no ?

Answer 1

In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. It is traditionally represented by the symbol Z. The atomic number uniquely identifies a chemical element. In an atom of neutral charge, the number of electrons also equals the atomic number.

The atomic number is closely related to the mass number, which is the number of protons and neutrons in the nucleus of an atom. The mass number defines the isotope of the element and often comes after the name of the element, e.g. carbon-14 (used in carbon dating).

The mass number (A), also called atomic mass number or nucleon number, is the number of nucleons (protons and neutrons) in an atomic nucleus. The mass number is unique for each isotope of an element and is written either after the element name or as a superscript to the left of an element's symbol. For example, carbon-12 (12C) has 6 protons and 6 neutrons. The full isotope symbol would also have the atomic number (Z) as a subscript to the left of the element symbol directly below the mass number: . Note that this is redundant, as there is a one-to-one mapping between atomic number and element symbol, so it is rarely used, except when we want to clarify the number of protons in a nucleus, such as in atomic reactions.

Answer 2

The atomic number is the number of proteons in the nucleus of the atom. Also called the proton number, this is eaul to the number of electrons in the neutral atom and indicates the position of the element in the periodic table.

The mass number is the number of protons plus neutrons in the atom. Given the symbol, A
A = p + n

A is also referred to as the nucleon number.

Answer 3

Atomic number is a reference to a elements number in the periodic table and equals the number of protons in the atom, ie) Hydrogen = atomic number 1, atomic protons 1
Mass number is the mass of the element. For every proton and neutron 1 atomic mass is added.

Answer 4

The mass is the total mass (weight) of the element, this means protons and neutrons, the atomic number is the amount of protons in the nucleus

Answer 5

atomic no.(number) is the position of the element on the periodic table, and mass number is how heavy one atom of the element is.

Answer 6

Atomic # - # of Protons
Mass # - # of Protons + Neutrons

Answer 7

atomic number is the number of protons in the nucleus
mass number is the number of protons+neutrons in the neucleus

Answer 8

wow