Question

Answer the following question
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Answer 1

Answer:

A =11 = 23-12

B = 40 = 20+20

C = 22 = 40-18

1| isobar = same mass different atomic no

so it is element Y and Z

2| Number of electrons = atomic no

atomic no of Y = 20

number of electrons = 20

in K shell =2

L shell 8

M shell =8

(maximum electron in a shell =8)

in k shell =2

3| Na is the answer

it has 11 electron and mass is 23