Chemistry, asked by rakshatiwari961, 10 months ago

which one of the following is not monoatomic
a. Helium
b. hydrogen
c. carbon
d. sodium

which of the following element has variable valency 4
a. iron
b. lead
c. copper
d. mercury

Answers

Answered by neeraj5892

2

Explanation:

1.option b hydrogen is the answer dear mate

2.Lead is the answer dear user

Answered by sireeshapaleti85

0

Answer:

1)sodium

2)copper and mercury

Explanation:

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