1.

An element ‘X’ has mass number 35 and the number of neutrons, is 18. Identify the group number and period of ‘X’.

Answer»

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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