Question

Element A, B, C, D and E have atomic numbers 4, 9, 13, 17, and 20 respectively. Write their electronic distribution (b) determine their valency (c) classify them as metals and non metals?

Answer 1

ELECTRONIC DISTRIBUTION
A-2,2
B-2,7
C-2,8,3
D-2,8,8,2
VALENCY
A-2
B-1
C-3
D-2
CLASSIFICATION
A-METAL
B-NON-METAL
C-METAL
D-METAL

Answer 2

Explanation:

For given elements, the electronic distribution, valency and classification of metals and non-metals is as follows.

Element A have atomic number 4, and its electronic distribution is 2, 2. Valency is 2 and it is a metal.

Element B have atomic number 9, and its electronic distribution is 2, 7. Valency is 1 and it is a non-metal.

Element C have atomic number 13, and its electronic distribution is 2, 8, 3. Valency is 3 and it is a metal.

Element D have atomic number 17, and its electronic distribution is 2, 8, 7. Valency is 1 and it is a non-metal.

Element E have atomic number 20, and its electronic distribution is 2, 8, 8, 2. Valency is 2 and it is a metal.