A simple ion of element A can be represented with mass number 2x+2, atomic number x and charge 2+ (written ²ˣ⁺²ₓA²⁺).
How many electrons are present in this ion?
A) 2x
B) x+2
C) x
D) x−2
E) 2x+4
IMAT 2023 · Question 33
Q33 - Atomic structure
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The correct answer is D) x−2.
Electrons in a neutral atom equal the atomic number, x. A 2+ charge means two electrons have been lost.
Electrons = x − 2
The mass number is just there to distract you. It only tells you the number of neutrons.
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