Question

Atomic number of a few elements is given below 10, 20, 9, and 12
a) Identify the elements.
b) Write electronic configuration of each of these elements.
c) Determine the valency of these elements.

Answer 1

Answer:

a) 10: Ne(Neon)

20: Ca(Calcium)

9: F(Flourine)

12: Mg(Magnesium)

b) 10: 2,8

20: 2,8,8,2

09: 2,7

12: 2,8,2

c) 1. Valency of Neon is 0 as it has no valence electrons in its outermost shell.

2. Valency of Calcium is 2 as it has 2 valence electrons in its outermost shell.

3. Valency of Flourine is 1 as it has 7 electrons in its outermost shell and requires 1 electron to complete it's octet.

4. Valency of Magnesium is 2 as it has 2 valence electrons in its outermost shell.