here is your next question.
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Answer:
It's very simple.
Explanation:
If you have understood the electronic configuration properly, You will tell it very easily.
Na =(2,8,1). After one electron loss it attains the configuration of neon which is an inert gas and is highly stable. so drawing the second electron from an inert gas configuration is very very energy consuming.
On the other hand
Mg= (2,8,2) After loss of one electron it's configuration becomes (2,8,1) The second electron can also be taken out easily.
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