1. Write the general electronic configuration of Group 17 element… - Vidyadip

Question

Write the general electronic configuration of Group $17$ elements.
What is the oxidation state and covalency of Al in $[AlCl(H_2O)_5]^{2+}?$
Which out of the following will have the most negative electron gain enthalpy and which have the least negative?

$P, S, Cl$ and $F.$

✓

Answer

$ns^2 np^5$ is the general electronic configuration of Group $17.$
The oxidation state of Al in is $+3,$

$x - 1 + 0 = +2$

$x = +3$

The covalency of 'Al' is $6.$

Across a period, electron gain enthalpy becomes more negative as we move from left to right. In case of Cl, n = 3, added electron occupies a larger region of space and electron-electron repulsion is much less. So, it has higher negative value. Therefore, 'Cl' has highest negative electron gain enthalpy and 'P' has least negative electron gain enthalpy.

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