• gr 7 revision atomic structure
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  • The symbol of sodium atom is ………………., while that of sulphur atom is ………………….
    Na - S
  • The mass number is the sum of ……………… number and …………., which exist in the nucleus .
    protons neutrons
  • Electron are particles with ………….. charges , while proton are particles with …………….. charges
    positive - negative
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