Question

1s22s22p63s23p64s23d104p5 Which element is this?

Answer 1

Br

This is because if u follow the periodic table u will do energy level 1 the 2 and so on and so forth until u reach the element.

Answer 2

Explanation:

As the given electronic configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$. This shows that there are in total 35 electrons and 7 valence electrons.

Also, we know that bromine is the element that has atomic number 35. And, since it belongs to group 17 so it has 7 valence electrons.

Thus, we can conclude that the given element is bromine.