Elements of Life keywords 0.0 / 5 ? ChemistryKeywords we have to knowASOCR Created by: catherine_hkrCreated on: 29-04-14 12:35 Atomic Number The number of protons in the nucleus of an atom, equal to the number of electrons 1 of 5 Mass Number The number of protons and neutrons in the nucleus of an atom 2 of 5 Isotope Atoms of the same element with a different number of neutrons in the nucleus and hence a different mass number 3 of 5 Avogadro Constant (NA) 6.02 x 10^23, the number of particles in 1 mole of a substance 4 of 5 Relative Isotopic mass The mass of an atom of an isotope compared with one-twelfth of the mass of Car 5 of 5
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