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Trend in Ionisation Enthalpy

IE1 value of ...

Question

$I E_{1}$ value of $M g$ is more than that of $N a$ while its $I E_{2}$ value is less. Explain?

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Solution

The $2^{n d}$ I-E of sodium is higher than that of magnesium because after losing an electron, sodium attains the stable noble gas configuration. On the other hand, magnesium after losing one electron still has one electron.

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