An element ‘X’ has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of ‘X’. Also write group number, period number and valency of ‘X’.


Mass number of X = 35
Number of neutrons = 18
Atomic number = Mass number – Number of neutrons
= 35 – 18 = 17
Therefore Atomic Number of X= 17
Electronic configuration of X = 2, 8, 7
Group of X = 17
Period of X = 3
Valency of X = 1

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Updated on: 10-Oct-2022

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