The term hydride gap refers to which region of periodic table?

Hydride gap is referred to which region of the periodic table?

What is hydride gap?

Name or state the following with reference to the elements of the first three periods of the periodic table. Alkaline earth metal in Period 3.

Name or state the following with reference to the element of the first three periods of the periodic table. Metalloid in Period 3.

Name or state the following with reference to the elements of the first three periods of the periodic table. Metalloid in Period 3.