An element "X" has mass number 35 and the number of neutrons, is 18. Identify the group number
and period of "X".Also identify"X"
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Group number of X is 17
Period number of X is 3
the element X is chlorine
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Mass number = no. Of proton+no. of neutron
35=no of proton+18
No. of proton=35-18
=17
Atomic number =number of proton
Atomic number =17
Group number =17
Period =3
X= chlorine
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