Question

The atomic numbers of three elements A, B and C are 5, 7 and 10 respectively. Which two of these will have similar properties? Give reasons

Answer 1

HI there ..

Element A -->
Atomic no: = 5
No: of protons = 5
No: of electrons = 5
Electronic configuration = 2 , 3
Valency = 3

Element B -->
Atomic no: = 7
No: of protons = 7
No: of electrons = 7
Electronic configuration = 2 , 5
Valency = 3

Element B -->
Atomic no: = 10
No: of protons = 10
No: of electrons = 10
Electronic configuration = 2 , 8
Valency = 0

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Valency of A and B are the same.

Hence , the Elements A and B will have similar chemical properties.