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Among CaH $_2,$ BeH $_2,$ BaH $_2,$ the order of ionic character is

medium

Classification of Elements and Periodicity in Properties

2018

chemistry

BeH $_2 <$ BaH $_2 <$ CaH $_2$

Explanation

To determine the order of ionic character among CaH $_2,$ BeH $_2,$ and BaH $_2,$

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CaH $_2 <$ BeH $_2 <$ BaH $_2$

BeH $_2 <$ CaH $_2 <$ BaH $_2$

BaH $_2 <$ BeH $_2 <$ CaH $_2$

we need to consider the concept of ionic and covalent bonding.

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The ionic character of a compound is influenced by the difference in electronegativity between the elements involved.

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In general, the greater the difference in electronegativity, the more ionic the bond.

\\

For metal hydrides, the ionic character increases with the size of the metal cation.

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This is because larger cations have lower electronegativity, leading to a greater difference in electronegativity with hydrogen.

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Let's analyze the given hydrides:

\\

•

BeH

_2:

Beryllium is a small cation with relatively high electronegativity among the alkaline earth metals.

\\

•

CaH

_2:

Calcium is larger than beryllium and has lower electronegativity.

\\

•

BaH

_2:

Barium is even larger than calcium and has the lowest electronegativity among the three.

\\

Thus, the order of increasing ionic character is determined by the size of the metal cation:

\\

BeH

_2 <

CaH

_2 <

BaH

_2 \\

Therefore, the correct order of ionic character is:

\\

Option 3:

BeH

_2 <

CaH

_2 <

BaH

_2 \\