Question

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Calcium – $${\phantom{A}}_{\phantom{20}}^{\phantom{40}}{\phantom{A}}_{\phantom{2}20}^{\phantom{2}40}\mathrm{Ca}$$

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Answer 1

Calcium – $${\phantom{A}}_{\phantom{20}}^{\phantom{40}}{\phantom{A}}_{\phantom{2}20}^{\phantom{2}40}\mathrm{Ca}$$
Atomic number Z = p = e = 20
Mass number    A = p + n
                         40 = 20 + n
∴ n = 40 − 20 = 20
     Ca
15 = 2, 8,  8,   2
        (K, L, M, N)