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Question
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Solution
Elements that have the same number of outermost shells are put in the same period as those that have the same number of valence electrons.
The atomic of the element is 16.
The electronic configuration of the element is 2, 8, 6.
It has 6 valence electrons in the 3rd orbit. So, it is placed in third period and 16th group of the periodic public.
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