Question

The electronic configuration of the element which is just above the element with atomic number 43 in the same group is ________.

• (i) 1s2 2s2 2p6 3s2 3p6 3d5 4s2

• (ii) 1s2 2s2 2p6 3s2 3p6 3d5 4s3 4p6

• (iii) 1s2 2s2 2p6 3s2 3p6 3d6 4s2

• (iv) 1s2 2s2 2p6 3s2 3p6 3d7 4s2

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Answer 1

On the basis of the option s given we can guess that the element is in the 4 period

So the element with atomic no 43 must be in the 5 the period

According to the magic no rules

2 8 8 18 18 32 32

The atomic no increases by 18 as it goes from 4 the period to 5 the period

Hence the answer is

43-18=25

Hence the answer is a

1s2 2s2 2p6 3s2 3p6 3d5 4s2

I hope this helps ( ╹▽╹ )