8. Write the names from the description.
a. The period with electrons in the shells K, L and M.
⇒ Third period
b. The group with valency zero.
⇒ Group-8 noble gases
c. The family of nonmetals having valency one.
d. The family of metals having valency one.
e. The family of metals having valency two.
⇒ Alkaline Earth Metal
f. The metalloids in the second and third periods.
⇒ Boron and silicon
g. Nonmetals in the third period.
⇒phosphorus, sulphur and chlorine
h. Two elements having valency 4.
⇒ carbon and silicon