2. Chemistry
Isotopes
Multiple Choice
Multiple ChoiceThe most common form of calcium has 20 protons, 20 neutrons, and 20 electrons. Which of the following elements would be an isotope of calcium?
A
An atom with 21 protons, 20 neutrons, and 21 electrons
B
An atom with 20 protons, 20 neutrons, and 18 electrons
C
An atom with 21 protons, 21 neutrons, and 21 electrons
D
An atom with 20 protons, 21 neutrons, and 20 electrons
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