Atoms, Molecules and Ions

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Chemistry

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Protons
________ and neutrons are in the nucleus which is positively charged and contains most of the mass.
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Atom
________ is electrically neutral as the number of positively charged protons is equal to the number of negatively charged electrons.
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Noble gases
Atoms (________) in group 18 are stable due to having a Completely Filled Outermost Electron Shell (CFOES) and are inert and exist as single atoms.
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Mass
________ is conserved during a chemical reaction.