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The atom of an element has electronic co...

The atom of an element has electronic configutation 2,8,7.
(a) What is the atomic number of this element?
(b) To which of the following elements would it be chemically similar? (Atomic numbers of elements are given in parentheses)
`N(7),F(9),P(15),Ar(18)`

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(a) 17 (b) F (9)
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
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