If the atomic mass of an atom is #23*"amu"#, and there are 12 neutrons, how many protons are present?
The mass of an atom depends on the number of nuclear particles: neutrons, massive particles with zero charge; and protons, massive particles with positive charge.
The number of protons gives
You don't have to be remember these numbers, because you should always have access to a Periodic Table (yes, even in exams). And thus you should be able to tell me for what element
But of course there is another layer: the phenomenon of
Let's take the simplest atom, hydrogen. Since
A smaller percentage of hydrogen nuclei contain 2 neutrons, to give the
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