What will be the answer?

Dear student
PLease find the solution to the asked query:

The elements mentioned above with their configurations are as follows:
Mg(12) : 1s22s22p63s2
N(7) : 1s22s22p3
​F(9) : 1s22s22p5
C(17) : 1s22s22p63s23p5

Out of these elements , N and F have their last electron in the 2p subshell. ​And out of N and F, 
Fluorine has the higher atomic number. [though Cl has the highest atomic number, the last electron in Chlorine lies in the 3p shell]

Thus according to the question the answer is Flourine.

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