an element 'X' has mass no.35 and the boys. of neutrons is 18 identify the group no. and period of 'X'
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group number 17 and period 3
anne16:
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period 3 group no.17
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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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