Mass number of X = 35
No . of Neutrons = 18
∴ Atomic number of element X =( Mass number of X - No. of neutrons )
= (35 - 18 ) = 17
∴ The electronic configuration of this element X = 2,8,7
So , this element belongs to Group number 17 and Period number is 3 .
Hence , the following element is Chlorine .
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Mass number of X = 35
No . of Neutrons = 18
∴ Atomic number of element X =( Mass number of X - No. of neutrons )
= (35 - 18 ) = 17
∴ The electronic configuration of this element X = 2,8,7
So , this element belongs to Group number 17 and Period number is 3 .
Hence , the following element is Chlorine .