Elements Elements?

Question

I need to know how to find the number of neutrons and electrons using only the periodic table and how do i do that.

Answer 1

the number of protons is always equal to the number of electrons unless it's an ion but the periodic table only shows you the stable atoms of an element so if the number of protons is 34 on the periodic table than so is the number of electrons.

Answer 2

When you look at the periodic table box for an element, the whole number given is the atomic number. It is equal to the number of protons, and it is also equal to the number of electrons. The other number given, a larger number with a decimal point is the atomic mass. You round this off to the neares whole number and subtract the atomic number from it to get the number of neutrons.

Answer 3

on the periodic table you have cases with atomic number of atoms.This number called Z is the number of protons/ Under the symbol of the elements you see a number which is the mass number called A. You take the integer close to this number. The number of neutrons is N=A-Z
Caution : there exist some atoms having more than 1 stable isotope ex, Cl chlorine which has 2 isotopes Cl 37 and Cl35 which are stable so the problem is more difficult and you must calculate N for each isotope