Proton - Sub-atomic particle with + charge, Electron - Sub-atomic particle with - charge, Neutron - Sub-atomic particle with no charge, Bromine - Liquid non-metal at room temp, Mercury - Liquid metal at room temperature , Eight - Number of protons in oxygen atom, Seventeen - Number of electrons in chlorine , Ten - Number of neutrons in fluorine, Nucleus - Centre of atom is called a ?, Three - Atomic number of lithium , twelve - Number of neutrons in a sodium atom, zero - Number of neutrons in a hydrogen atom, nine - Number of electrons in a fluorine atom, shells - electrons are found in..., vacuum - Proper word for empty space,

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