Question

8. Write the names from the description.
a. The period with electrons in the
shellsK, L and M.
b. The group with valency zero.
c. The family of nonmetals having
valency one.
d. The family of metals having
valency one.
e. The family of metals having
valency two
f. The metalloids in the second and
third periods.
g. Nonmetals in the third period.
h. Two elements having valency 4.​

Answer 1

Answer:

Q8

a. 3rd period

b. Group 18

c.Halogens

d. Alkali Metals

e. Alkali Earth Metals

f. Boron and Silicon

g. Phosphorus,Sulphur and chlorine

h. Carbon and Silicon

Explanation:

a. 3rd period- as it has 3 shells so it is present in 3rd period.

b. group 18- it has elements with valency 0,i.e. inert gases.

c. halogens-group 17 has valency 1 which are called halogens.

d. Alkali metals- it has elements with valency 1.

e. Alkali Earth Metals- It has metals with valency 2.

f. Boron and Silicon- 2nd period- Boron

                                  3rd period- Silicon

g. Phosphorus,Sulphur and chlorine- These are non metals present in 3rd period.

h.  Carbon and Silicon-both of these have valency 4

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