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An atom has electronic configuration 2, ...

An atom has electronic configuration 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 are given in parentheses.)
N(7) F(9) P(15) Ar(18)

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(a) The atomic number of this element is 17.
(b)It will be chemically similar to Fluorine as they both have same number of valence electrons.
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OSWAL PUBLICATION-DIKSHA QUESTIONS -PERIODIC CLASSIFICATION OF ELEMENTS (SHORT ANSWER)
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