How do u determine the # of electrons in an atom?

Answer 1

Atoms are inherently neutrally charged, they have equal numbers of protons (+) and electrons (-) for an overall net charge of zero.

The number of electrons around an atom equals the number of protons in the nucleus of the atom.
The number of protons an atom has equals the atom's atomic number of whatever type of element it is.

For example, Hydrogen has an atomic number of 1, so it has 1 proton and 1 electron.

Answer 2

The number of electrons in an atom is the same as the number of protons, which is the atomic number of the element.

Examples:
Hydrogen's atomic number is 1, so a single hydrogen atom has 1 electron.
Oxygen's atomic number is 8, so a single oxygen atom has 8 electrons.

This is all assuming the atom is not charged. If it's charged, it's called an ion, and it either has extra or missing electrons depending on the charge.

Answer 3

Go to the Periodic Table of Elements to find your element's atomic number and atomic weight. The atomic number is the number located in the upper left corner and the atomic weight is the number located on the bottom.

The atomic number is the number of protons in an atom of an element. For example, krypton's atomic number is 36. This tells you that an atom of krypton has 36 protons in its nucleus.

By definition, atoms have no overall electrical charge. That means that there must be a balance between the positively charged protons and the negatively charged electrons. Atoms must have equal numbers of protons and electrons.

In the example, an atom of krypton must contain 36 electrons since it contains 36 protons.

Answer 4

the atomic number is the the number of protons and the
number of electrons is the same as the protons
because both charges have to cancelle each other out

Ex
S Atomic#=16
so electron is 16

Answer 5

Simply by looking at the atomic number on the top of the coresponding element at the periodic table , for example THE ELEMENT Na ( sodium ) has 11 electrons. I am talking about the number of electron as an element. It can change by a reaction, because some element like to give electron(s) ( cation), others like to accept it/them (anion). Note : electron(s),which means some element give 1,2 or 3.(for example transition metals).
The same thing is true for others(anion) that like to accept electron(s)

Answer 6

yes if you know the charge of the atom and what type of atom it is
find the element on the periodic table and the atomic number=number of protons
now find the charge of the atom and use that to find the amount of electrons

Answer 7

its elements atomic number [if it is an atom of hydrogen, for example, it has the atomic number of 1 and therefore has one electron]

Answer 8

The number of electrons is equal to the number of protons unless there is a charge indicated. If so just add or subtract the indicated charge from the number of protons. (+ charge=fewer electrons)