28. The electronic configuration of an element is 2, 8, 7:
(a) What is the atomic number of this element?
(b) to which of the following elements is this element chemically similar?
N(7). 719) P015). Ar(18)
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(a)The atomic number of element with electronic configuration 2,8,7=17.
(b)It has 7 valence electrons, therefore it would be chemically similar to F(9)=2,7.
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