Question

For an element x having atomic number 17 and mass number 35 .find the valency?.

Answer 1

Valency is 1 because

K. L. M.

2. 8. 7

the it will take 1 electron to stable hence its valency is one

Answer 2

The valency is 1.

• An element x has the atomic number 17 and the mass number 35. The element x is Chlorine.
• The electronic configuration of x or Cl is as follows-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{1} {3p}^{6}$
• One electron from 3s orbital transfers to 3p orbital to become full filled.
• Thus 3p orbital has 6 electrons and is highly stable and the 3s orbital has one electron.
• Thus its outermost orbital has one electron.
• So, its valency is 1.