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Atomic Radii and Ionization Energy (Group 1)

How number of...

Question

How number of electrons affect the effective nuclear charge and ionic radius?

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M g^{2 +}

A l^{3 +}

are isoelectronic but ionic radius of

A l^{3 +}

is less than of

M g^{2 +}

Reason: The effective nuclear charge on the outershell electrons in

A l^{3 +}

is more than that in

M g^{2 +}

{Mg}^{2 +}

{Al}^{3 +}

are isoelectronic but ionic radius

{Al}^{3 +}

is less than that of

{Mg}^{2 +}

.
Reason: The effective nuclear charge on the outer-shell electrons in

{Al}^{3 +}

is more than that in

{Mg}^{2 +}

.

N a^{+}

A l^{3 +}

are isoelectronic but the magnitude of ionic radius of

A l^{3 +}

is less than that of

N a^{+}

. Reason: The magnitude of effective nuclear charge of the outershell electrons in

A l^{3 +}

is greater than that in

N a^{+}

.

N a^{+}

A l^{3 +}

are isoelectronic but the magnitude of ionic radius of

A l^{3 +}

is less than that of

N a^{+}

.
Reason: The magnitude of effective nuclear charge on the outer shell electrons in

A l^{3 +}

is greater than that in

N a^{+}

Q. The covalent radius of arsenic atom is 1.21

˙ A

and effective nuclear charge of 4p electrons is equal to 6.4. The electronegativity of arsenic atom is ?

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