Question

An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
Group 1
Group 2
Group 13
Group 14.​

Answer 1

1st group.

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Answer 2

An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong? answer is group_1