An atom has electronic configuration 2,8,7. what is the atomic number of this element ?
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Answer:
17
Explanation:
Electronic configuration of an atom = 2, 8, 7
As the electronic configuration of the given atom is 2,8,7 it is inferred that the atomic number of element is 17 (2+8+7).
Thus, the element is chlorine with the atomic number 17
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