'The atomic number of an element is the number of protons in one atom of that element'
- All atoms of a given element have the same atomic number and each element has a different atomic number
- A neutral atom must have the same amount of elecrtons as protons, so the atomic number of a neutral atom is also the number of electrons
Isotopes
'Isotopes are atoms of the same element with different numbers of neutrons'
'An isotope is an atom of an element with a specified number of neutrons'
'The mass number of an isotops is the number of nucleons in an atom of the isotope'
- Isotopes of the same element have almost identical chemical and physical properties
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