The reactivity of the metals $A l, C a, M g$ and $N a$ follows the order.

N a > C a > M g > A l

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N a > M g > C a > A l

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A l > M g > C a > N a

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M g > N a > C a > A l

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Solution

The correct option is A $N a > C a > M g > A l$
The reactivity of the metals $A l, C a, M g$ and $N a$ follows the order
$N a > C a > M g > A l$ .
In the third period, as we move from left to right, the ionisation energy increases. This decreases the reactivity. Hence, the order of reactivity for the third period will be $N a > M g > A l$ .

Now consider $C a$ and $M g$ present in group IIA. As we move down the group, the ionisation energy decreases. This increases reactivity. Hence, $C a$ is more reactive than $M g$ .

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.
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The reactivity of the metals Al, Ca, Mg and Na follows the order.

The reactivity of the metals $A l, C a, M g$ and $N a$ follows the order.