We are asked to determine the number of protons, neutrons, and electrons in a magnesium atom with a mass number of 25.
Recall that mass number is equal to the sum of the protons and neutrons in the atomic nucleus.
Mass Number = # protons + # neutrons
Also, recall that for a neutral atom, the atomic number is the number of protons and the number of protons equals the number of electrons.
Atomic Number = # protons = # electrons
How many protons, neutrons, and electrons does a magnesium atom with a mass number of 25 contain?
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