an element X has a mass number 35 and the number of neutron is 18 identify the group number and period period of x
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group no.17 period is 3
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Protons+ Neutrons= Atomic Mass
Protons= Atomic mass-Neutrons
∴ 35-18=17
Protons=17
We know that,
no. of protons= Atomic Number
∴ Atomic Number= 17
Electronic Configuration is 2,8,7
It belongs to group 3 as there are 3 shells.
It belongs to Period 17 as the valence electrons increase from 1-8 in a period.
Hope this helps:)
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