A) atomic numbers
B) atomic masses
C) number of principal energy levels
D) number of valence electrons
Correct Answer: A
Solution :
If elements are arranged in order of their increasing atomic numbers, element coming at intervals of 2, 8, 8, 18, 18, 32 and 32 will have similar physical and chemical properties and thus grouped in one particular group.You need to login to perform this action.
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