Question

How many elements are included in the IA group?
A. 4
B. 5
C. 6
D. 7

Answer 1

Hint: The group IA of the periodic table are known as alkali metal elements which have one electrons in the outermost shell which they can easily lose to form metal cation with +1 charge

Complete step by step answer:
The group IA of the periodic table contains alkali metal elements hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and francium (Fr) with the exception for hydrogen. The alkali metals are highly reactive metals which easily get tarnished when reacted with air. They are shiny in texture, soft and generally have low melting point. The metal oxides of these metals on dissolving in water form a basic solution.
The alkali metal elements have single electrons in their outermost orbital $n{s^1}$. The alkali metals in their respective period are considered as the largest element with lowest ionization energy. The electrons present in the outermost shell can be easily removed to form cation with +1 charge. Alkali metals are solid in nature.
Salts formed of elements present in group IA are highly soluble in water. As the alkali metal ions are relatively large, they have low charge density, so they can be easily removed from the anion and can be solvated by polar solvents.
The alkali metal reacts with water to form metal hydroxide and hydrogen gas. It is an exothermic reaction as heat is released.
Total six elements are present in the IA group.
So, the correct answer is “Option C ”.

Note:
Hydrogen is a non-metal and is not considered as the element of group IA as it shows characteristics like both alkali metals and halogens, so it is placed exceptionally above in the periodic table.