Question

why alkali metal hydrides are ionic solids with high melting point ?

Answer 1

The stability of hydrides decrease from Li to Cs It is because of the fact that M-H bond becomes weaker due to increase in the size of Alkali metals down the group.

Answer 2

Alkali metal hydrides are ionic solids that are white and have high melting points.

What are ionic solids?

Ionic solids are crystalline solids in which the particles that make up the crystal are positively and negatively charged ions that are held together by strong electrostatic forces of attraction. Ionic solids are extremely hard, have low volatility, and have extremely high melting and boiling points.

• Alkali metal hydrides are ionic solids because alkali metals have a larger size and lower ionization energy than other metals.
• Because these ionic bonds are non-directional, one ion is surrounded by many opposite neighboring ions, and the solid is formed.
• As a result, the melting point is high.

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