Question

Metals will be out of $13,31,35,54$ :

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

Answer 1

The correct option is A $13,31$

Elements with atomic number 13, 31, 35, and 54 are from P-Block.

For atomic no. $13$,

$P=3,$

$3+1=4$ ,

number of valence electron(N)$=3$

$P+1>N$

i.e; metal

For atomic no. $31$,

$P=4,$

$4+1=5$ ,

number of valence electron(N)$=3$

$P+1>N$

i.e; metal

For atomic no. $35$,

$P=4,$

$4+1=5$ ,

number of valence electron $=7$

$P+1<N$

i.e; non-metal

For atomic no. $53$,

$P=5$,

$5+1=6$ ,

number of valence electron$=7$

$P+1<N$

i.e; non-metal