Which subatomic particles are found in the nucleus of the an atom?

Where is most of an atoms mass?

Approximately how many known elements are there?

What 2 subatomic particles are equal in an atom?

Who named the atom?

Where is most of the volume of the atom?

Number of electrons that can be held in the first 3 energy levels

The periodic table is arranged by

Atomic mass minus protons equals

If potassium has an atomic number of 19 and an atomic mass of 39.09, how many neutrons does it have?

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