An element has an atomic number of and atomic mass of .
(I)How many electrons are there in each atom of the element?
(ii) How are these arranged in the atom?
1. For any neutral atom the number of protons and electrons is same as the atomic number of atom.
Hence,
No. of protons =
No. of electrons=
Given element is Potassium (K) with Z = 19 and A = 39
2. These electrons are arranged in the atom as
There are electrons, electrons go in the shell, electrons in the shell, electrons in the shell, and electron in the shell.