An element X has mass number 35 and number of neutrons 18. Write atomic number, number of protons and electronic configuration of 'X'. Also write valency of 'X.
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Answer:
As per formula
NO. of neutrons = atomic mass + numbers of proton
35 = 18 + number of protons
35-18=17
NO. of protons = 17
No. of electrons = 17
Atomic no. of X = 17
So,
electronic configuration of X = 2,8,7
valency of X = 8-7 = 1^-
Element X is chlorine and member of group 3 and period 3
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Explanation:
Atomic number of X = Mass number of X - Number of neutrons =35-18=17
Therefore, electronic configuration of X = 2, 8, 7
Group number = 17
Period number = 3
Valency=8-7=1
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