Proton - positive particle found in an atom, Neutron - neutral particle found in an atom, Electron - negative particle found in an atom, mass number - protons + neutrons, atomic number - number of protons, isotopes - atoms with same atomic number but different mass number, number of neutrons - mass number - atomic number =, 2, 8, 1 - electron arrangement of sodium, 2 - total number of electrons in first energy level, 13 - number of protons in an aluminium atom, 8 - number of electrons in an oxygen atom, protons and neutrons - particles found in the nucleus, 1 amu - mass of a proton or a neutron, nucleus - centre of an atom, energy levels - electrons are found here, relative atomic mass - average mass of the different isotopes, 0 or 1/1840 - mass of an electron, 9 - atomic number of fluorine, Noble gases - name of group with full outer energy level of electrons, Alkali metals - name of group with 1 electron in outer energy level,

N5 Chemistry - Atomic Structure

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