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
2
Explanation:
1.option b hydrogen is the answer dear mate
2.Lead is the answer dear user
Answered by
0
Answer:
1)sodium
2)copper and mercury
Explanation:
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