This atomic particle has a negative charge and very little mass.

The nucleus of an atom contains which two particles?

This particle is found in the nucleus and has a positive charge.

The number of protons in a nucleus determines:

What caused the scientific community to accept Rutherford's atomic model?

Which best explains why changes to the atomic theory were necessary?

Why do scientists need scientific models?

Modern atomic theory states that atoms are neutral. How is this neutrality achieved in atoms?

A neutral atom of sodium (Na) has an atomic number of 11 and a mass number of 23. How many neutrons would be found in the nucleus of this atom of sodium?

Two atoms that have the same atomic number but different mass numbers are called

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