The first ionisation potential of $N a, M g, A l$ and $S i$ are in the order:

N a < M g < A l > S i

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N a < M g > A l < S i

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N a > M g > A l > S i

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M g > N a > S i > A l

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Solution

The correct option is A $N a < M g > A l < S i$
Ionisation potential increases when we move from left to right in a period. But this increase in not regular. The members of second group have more ionisation potential then members of third group due to stable half filled s orbital.
$∴$ $N a < M g > A l < S i$ is correct order of ionisation potential.

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The first ionistation enthalpies of Na, Mg, Al, and Si are in the order
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Question 17
Arrange the following elements in the order of their decreasing metallic character
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$N a^{+} . M g^{2 +}, A l^{3 +}$ and $S i^{4 +}$ are isoelectronic. The order of their ionic size is

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. The elements to which these energies correspond respectively are:

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The first ionisation potential of Na,Mg,Al and Si are in the order:

The first ionisation potential of $N a, M g, A l$ and $S i$ are in the order: