${ }_{20}^{40} \mathrm{Ca}$ contains how many neutrons?
A)20
B)40
C)60
D)None of the above.

Name: ${ }_{20}^{40} \mathrm{Ca}$ contains how many neutrons? A)20 B)40 C)60 D)None of the above.
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The number of neutrons in an atom can be found by subtracting the atomic number (number of protons) from the mass number. For ${ }_{20}^{40} \mathrm{Ca}$, the atomic number is 20 and the mass number is 40. Therefore, the number of neutrons is 40 - 20 = 20.

2040Ca{ }_{20}^{40} \mathrm{Ca}2040​Ca Contains How Many Neutrons? A)20 B)40 C)60 D)None of the

${ }_{20}^{40} \mathrm{Ca}$ Contains How Many Neutrons?
A)20
B)40
C)60
D)None of the