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An atom has the electronic configuration...

An atom has the 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 parenthesis) N (7), F (9), P (15), Ar (18)

Text Solution

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a] Atomic number of the element = number of electrons = 2 + 8 + 7 = 17.
b] The element is similar to an element having 7 valence electrons. For the given elements, their electronic configuration is:
`N(7) to 2,5, F (9) to  2,7,P (15) to 2, 8,5, Ar (18) to 2, 8, 8`
. Out of these elements, fluorine (F) has 7 valence electrons and is similar to the given metal with electron configuration 2, 8, 7.
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