Question

Non-metals will be out of elements with atomic number $13,31,35,54$.

• A. $13,31$
• B. $31,35$
• C. $35,54$
• D. $13,54$

Answer 1

Answer: (C)

$35,54$

According to the given information :

For$Z=13,P=3$ and $N=3$ ,

P+1 = 3+1 = 4 > N(3). It is a metal.

For $Z=31,P=4$ and $N=3$,

P+1 = 4+1=5 > N (3) It is a metal.

For $Z=35,P=4$ and $N=7$

P+1 = 4+1=5 < N (7) It is a non metal.

For $Z=54,P=5$ and $N=8$

P+1 = 5+1=6 < N (8) It is a non metal.

Non-metals will be $35,54.$