What is the atomic number of an ion with a -2 charge when it has 18 electrons? a)40 b)18 c)20 d)16

Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter5: Nomenclature
Section: Chapter Questions
Problem 72AP: An ion with one less electron than it has protons has a _________ charge.
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What is the atomic number of an ion with a -2 charge when it has 18 electrons?

a)40

b)18

c)20

d)16

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