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9 Terms
Atomic Number
Number if protons in the nucleus
Mass Number
The total number of protons and neutrons in the nucleus
Isotopes
Atoms of the same element with the same number of protons but different number or neutrons
Why do isotopes of the same element have the same chemical properties
They have the same electron configuration and the same number of electrons
Which physical properties of isotopes of the same elements might be different ?
Density
Mass
Boiling Point
Diffusion Rate
Relative Isotopic Mass
The mass of an isotope compared with 1/12th mass of an atom of Carbon-12
Relative Atomic Mass
The weighted mean mass of one atom of an element compared with 1/12th mass of an atom of Carbon-12
Molecular Formula
Actual number of atoms
Empirical Formula
Simplest whole number ratio
Note 
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