Question

The electronic configuration of three elements A, B and C are as follows.

A- 2,8,2 B- 2,8,7 C- 2,4

i. Which of these elements is a metal ?

ii. Which of these elements are non-metals ?

iii. Which two elements will combine to form an ionic bond ?

iv. Which two elements will combine to form a covalent bond ?

v. State the valency of element B and C​

Answer 1

Explanation:

1. A is a metal as it will lose two electrons to complete it's octet.
2. B is a nonmetal as it have to gain 1 electron to complete it's octet.
3. A combines with 2 atoms of B via ionic bonding.
4. C combines with atoms of B to form covalent bonds
5. valency of A is +2, B is -1 , C is +4

Answer 2

Answer:

i) A

ii) B

iii) A and B

iv) B and C

v) B=1

C=0