Question

‘Hydride gap’ is referred to which region of the periodic table?
(A) Group 3, 4, and 5
(B) Group 5, 6 and 7
(C) Group 7, 8 and 9
(D) Group 3, 5 and 7

Answer 1

In order to find the region of Hydride gap in the periodic table we must know what the hydride gap is and where it can be found. Hydrides will be formed whenever other elements combine with hydrogen. When this hydride formation is not possible in certain groups it will lead to a hydride gap.

Complete answer:
Before moving onto the hydride gap, let us find out what a hydride is. Hydride will be formed whenever any element will combine with Hydrogen. Hydrogen can combine with other elements by metallic, covalent and ionic bond. Elements with less electronegativity than hydrogen will form Ionic Hydride. Elements present in the group 1 and 2, when heated at high temperature it will form Ionic hydrides. When the p-block element and some of the s-block elements combine it can form covalent hydride. Because the electronegativity difference between these elements and hydrogen is comparatively very small. When we heat the dihydrogen under very high pressure, it will form interstitial or metallic hydrides. These dihydrogen are present in the d-block element of Group 3, 4, 5, 10, 11, 12 and some of the p-block elements. The formed interstitial hydrides are non-stoichiometric and will have variable composition. Hydride formation does not take place in all elements. The formation of hydrides is not possible in certain elements. The place where the formation of hydrides is not possible is known as hydride gap. When we observe the periodic table, we can observe that hydride formation does not take place in the Group 7, 8 and 9 of the periodic table.

Therefore, the correct answer is option (C) Group 7, 8 and 9.

Additional information:
Some examples of the hydrides are:
- Lithium Aluminium hydrides
- Sodium hydride
- Potassium hydride
- Magnesium hydride
- Silane
- Aluminium hydride
- Boron hydride

Note: - Hydrides are used as a reducing agent in many chemical reactions and in many chemical industries.
- Hydrides will be used as a base during organic synthesis.
- They are used in nickel hydride batteries.
- Metal hydrides can be used in hydrogen storage, heat storage and compressors capabilities.
- It can also be used in drying agents.