Answer:
Number of protons=17
Halogen
Explanation:
Given,
The electronic configuration:[tex]1s^2, 2s^2, 2p^6, 3 s^2, 3 p^5[/tex]
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.
