1.

N,C,O,B,Al which is the most electronegative element among these

Answer»

Electronegative elements are thise which are capable of getting electrons easily.

Generally, Non-Metals are more electronegative and metals are more electropositive.

Electronegativity INCREASES left to RIGHT (across) the PERIOD and DECREASES down the group.

Atomic Number of Boron (B) - 5 . (P-2 , G-13)
Atomic Number of Carbon (C) - 6 . (P-2 , G-14)
Atomic Number of Nitrogen (N) - 7 . (P-2 , G-15)
Atomic Number of OXYGEN (O) - 8 . (P-2 , G-16)
Atomic Number of Aluminium (Al) - 9 . (P-3 , G-13)

here P stands for 'Period' and G stand for 'Group'

So most electonegative element is Oxygen.


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