an atom has electronic configuration 2 8 7 to which of the following elements would it be chemically similar
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Question 5: 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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Answer
(a)
The electronic configuration describes the number of electrons present in each shell of an element. The atomic number is calculated by the summation of all the electrons present in each shell. Thus, the atomic number of this element is .
(b)
The elements would be chemically similar, if they possess same number of valence electrons.
The electronic configurations of all the given elements are shown below.
The valence electrons of given element is same as that of fluorine. Thus, the element with atomic number possesses similar properties to fluorine.