Hel Subshell electronic configuration of some elements are given

( symbols are not real)
A - [Ne] 3s 1
B - [Ar] 4s 2
C - [Ar] 3d 6 4s 2
D - [Ne] 3s 2 3p 4
a .What is the atomic number of B?
b . Which among the above has the highest electronegativity ?
c .Which of the above elements form coloured compound?

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16

explanation:

the marks go by 4s