Question

an element belongs to 4th period and the 2nd group write its shell wise and the sub shell wise electronic configuration .​

Answer 1

The element which belong to 4th period and the 2nd group is Calcium.
It's shell wise electronic configuration is: 2,8,8,2
It's sub shell wise electronic configuration is: 1s2 2s2 2p6 3s2 3p6 4s2


What is a period and a group?
The horizontal rows in a periodic table is called a period whereas the vertical column is called a group.
Being in 4th period means it has 4 shells and being in 2 group means it has 2 electrons in its last shell.
As a result it has It's shell wise electronic configuration 2,8,8,2
and sub shell wise electronic configuration is: 1s2 2s2 2p6 3s2 3p6 4s2

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