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What is a proton's charge?
Positive (+1).
Which subatomic particle is 2,000 times smaller than a proton?
The electron.
If an atom loses an electron, is it now a positive or negative ion?
Positive ion.
What does the mass number represent?
The sum of protons and neutrons in the nucleus.
How do you calculate the number of neutrons?
Mass number minus atomic number.
What determines the identity of an element?
The number of protons (atomic number).