What is the atomic number of element of period 3 and group 17 of the Periodic Table?

What is the atomic number of element of period 3 and group 17 of the Periodic Table?

Q. What is the atomic number of element of period 3 and group 17 of the Periodic Table?

A.            10

B.            4

C.            17

D.            21

Answer: 17

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