Question

Write the names
from the description.
a) The periods with the description.
b) The family of non-metals having valency one.
c) The family of metals having valency one.​

Answer 1

a)Periods are in horizontal on modern periodic table

b)Group 17 halogens having the valency one I family of non-metals

c)Group 1 hydrogen H2 having the valency one in family of metals