Question

1s22s22p63s23p64s23d104p5 Which element is this?

Answer 1

Step-by-step 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.