An elements "X" has mass number 35 and the number of neutrons , is 18. Identify the group numbers and period of "X".
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group number is 17 and period number is 3
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Answer:
We know :
Atomic number = Mass number - No. of neutrons.
Atomic number = 35 - 18
= > 17
Electronic configuration :
2 , 8 , 7
Group no. = 17
Period no. = 3
Name of element is Chlorine ( Cl ) .
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