Question

Four elements along a period have atomic number (11,13,16 and 17). The most metallic among these has atomic number

Answer 1

The most metallic among these has atomic number 11.
1)Atomic no. -11
Valency. -1
Group.-1
Period-3
2)Atomic no.-13
Valency-3
Group-13
Period-3
3)Atomic no.-16
Valency-2
Group-16
Period-3
4)Atomic no. -17
Valency-1
Group-17
Period-3

We know that metallic character decreases as we go from left to right in a period.
Since the element is in group 1 which is the left most group here, hence it is the most metallic.
Elements with atomic no. 16 and 17 are non metals
And element with atomic no. 13 is a metal.
Hope it helps you.
Plz Mark it as brainliest.

Answer 2

Answer:

the most metallic among has an atomic no. is 11. Because it is highly reactive element than other elements . so, most metallic among has an atomic no. is 11