Question

I.
Which element of group IA is not an alkali metal and why?​

Answer 1

Hydrogen is an element which does not have the properties of alkali metals but it is placed in the first group

Answer 2

Hydrogen (H) is the element of group IA which is not an alkali metal.

Explanation:

• The ionization enthalpy of the alkali metals is low but on the other hand, Hydrogen has a high value of the ionization enthalpy like the non-metals.
• Alkali metals form an alkaline oxide and hydroxide which dissolve in water to give an alkaline solution while on the other hand Hydrogen forms a neutral oxide that is H₂O.
• All the alkali metals are solid at room temperature while Hydrogen exists in the gaseous phase as a diatomic molecule (H₂).

Due to the above properties, Hydrogen (H) which is the element of group IA is not considered an alkali metal.

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