A neutral atom has the following electronic configuration: 1s2 2s2 2p6 3s2 3p5 How many protons are in the atomic nucleus and to which group of the periodic table does this element belong?

Number of protons=17

Halogen

Explanation:

Given,

The electronic configuration:

Atomic number= 2+2+6+2+5 = 17

Chlorine has the atomic number 17.

Symbol of chlorine= Cl

We know that,

The number of protons is equal to the atomic number.

Number of protons=17

And Chlorine belongs to the halogen group of the periodic table.

it is the most commonly accepted one

it is a solid

explanation: