Question

which of the following electronic configuration is correct for Sodium (atomic number=11)
a)2,9
b)2,6,3
c)2,8,1
d)2,8,2​

Answer 1

Answer:

c) 2,8,1

Explanation:

because it we add them up they will give us 11 .

a) is wrong bcuz 9 is not considered

b) is wrong bcuz 6 cannot be used as to full up the shells they need 8 from the second shell as the first one requires 2

d) adds up to 12 so not possible .

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Answer 2

Answer :

The electronic configuration 2,8,1 is correct for sodium .

Explanation :

in orbital structure of sodium

K shell can accommodate only 2 electrons

L shell can accommodate only 8 electrons

M shell can accommodate only 1 electron

Therefore, valency of sodium will be 1

and also it will have a positive charge as sodium will loose one electron while reaction with a non metal .

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