Question

This condition of having a valency of ______ is called ______.

Answer 1

Answer:

first group and alkali metals

Answer 2

Answer:

This condition of having a valency of  four  is called  tetravalency

Explanation:

Carbon has a valency of four, so it is capable of bonding with four other atoms of carbon or atoms of some other monovalent element. This is known as tetravalency of carbon.