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Which subatomic particles are found in the nucleus of the an atom?
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
The periodic table is arranged by
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
Number of electrons that can be held in the first 3 energy levels
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
If potassium has an atomic number of 19 and an atomic mass of 39.09, how many neutrons does it have?
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
What 2 subatomic particles are equal in an atom?
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
Who named the atom?
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
Approximately how many known elements are there?
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
Where is most of the volume of the atom?
2, 8, 18
100
20
atomic numbers
electron cloud
Democritus
protons and neutrons
protons and electrons
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