Question

An atom of an element is represented as 39/19x, write its

(1) number of protons
(2)number of neutrons
(3)Electric configuration
(4)number of valence electrons

Answer 1

Solution :

Lithium

Z = 3

P = 3

E = 3 = (2, 1) p=3

A = 7 n=4

P + n = A

3 + n = 7

N = 4



Carbon

Z = 6

P = 6

E = 6 = (2, 4) p=6

A = 12 n=6

P + n = A

6 + n = 12

N = 6