Atoms, Molecules and Ions

Protons

________ and neutrons are in the nucleus which is positively charged and contains most of the mass.

Atom

________ is electrically neutral as the number of positively charged protons is equal to the number of negatively charged electrons.

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.

Mass

________ is conserved during a chemical reaction.