An element ‘X’ has mass number 35 and the number of neutrons, is 18. Identify the group number and period of ‘X’.
An element ‘X’ has mass number 35 and the number of neutrons, is 18. Identify the group number and period of ‘X’.
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Atomic number of X = Mass number of X – Number of neutrons
= 35–18=17
Electronic configuration = 2, 8, 7
Group number = Valence electrons +10 = 17
Period = Number of shells= 3
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