An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
A. Group 1
B. Group 4
C. Group 2
D. Group 3Answer/ Explanation
Answer:A
An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
A. Group 1 B. Group 4 C. Group 2 D. Group 3Answer/ Explanation