Question

Elements A, B and C have atomic numbers $17$, $19$ and $10$ respectively. State which one is: ​

(i) a non-metal​

Answer 1

Electronic configuration of element A(atomic number $=17$) is $2,8,7$. So it accepts one electron to complete its octet. Therefore ‘A’ is non-metal.​

​Additional information: ​

Non-metals are the elements which form negative ions by the gain of electron(s). ​

Chlorine(atomic number $=17$) has $7$e in the outermost shell. So it accepts one electron to complete its octet.​