Q.
Want to Fund your own JEE / NEET / Foundation preparation ??
Take the SCORE scholarship exam from home and compete for scholarships worth ₹1 crore!*
An Intiative by Sri Chaitanya
a
1s22s22p6 3s2
b
4s
c
1s2 2s22p6
d
1s22s22p6 3s23p6 4s2
answer is C.
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