Question

Write the names from description
(1) The period with electrons in the shells K,L and M.

*(2) The group with valency zero.

(3) The family of nonmetals having valency one.

(4) The family of metals having valency two.

(5) The metalloids in the second and third period.

(6) The family of metals having valency one.

*(7) Nonmetals in the third period.

(8) Two elements having valency 4.

(9) First three noble gases.

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Answer 1

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Write the names from description

(1) The period with electrons in the shells K,L and M.

• Ans. Third period.

*(2) The group with valency zero.

• Ans. Group 18.

(3) The family of nonmetals having valency one.

• Ans. Halogen family.

(4) The family of metals having valency two.

• Ans. Group 2.

(5) The metalloids in the second and third period.

• Ans. Boron, silicon.

(6) The family of metals having valency one.

• Ans. Group 1.

*(7) Nonmetals in the third period.

• Ans. Phosphorus, sulphur and chlorine and argon.

(8) Two elements having valency 4.

• Ans. Carbon, silicon.

(9) First three noble gases.

• Ans. Helium, neon and argon.

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Answer 2

(1) The period with electrons in the shells K,L and M.=3period

(2) The group with valency zero.= is known as noble group.

(3) The family of nonmetals having valency one =will be all the elements from group 17 that are halogens

(4) The family of metals having valency two=Alkaline earth metals

5) The metalloids in the second and third period=are Boron and silicon.

(6) The family of metals having valency one=Alkali metals

7) Nonmetals in the third period.=the elements sodium, magnesium and aluminium.

(8) Two elements having valency 4=Carbon, Silicon.

(9) First three noble gases=helium (He), neon (Ne), argon (Ar)