Question

which is the stable configuration element 1s2,2s2p6,3s2,3p6,3d10 1s2,2s2,2p6,3s2,3p6,3d9,4s2​

Answer 1

Explanation:

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Answer 2

Answer:

A number of electrons present in valence shell of penultimate Shell represents the group of elements.

For s block elements: no.of group=number of valence shell electron.

p block elements: no. of group= 2 + 10 + number of valence electrons.

d block elements: no. of group= number(n-1)d electrons + number of electrons in nth shell.

Here, the differential electron is in p orbital hence, it belongs to p block

No. of group= 2+ 10 + 3=15 i.e 15th group or VA group