atomic number - number given to an element that represents the number of protons, electrons  - Subatomic particles in an atom with a negative charge and no mass, isotope - Two or more forms of an atom of the same element with a different number of neutrons in the nucleus and therefore a different mass, mass number  - Number that is the sum of all of the protons and neutrons in an atom. This is different for each isotope of an element , neutrons - Subatomic particles in the nucleus of an atom with no charge and a mass of 1 amu, protons  - Subatomic particles in the nucleus of an atom with a positive charge and a mass of 1 amu.,

2.5 Inside the Atom

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