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gr 7 revision atomic structure

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  • The mass number is the sum of ……………… number and …………., which exist in the nucleus .
    protons neutrons
  • -Active element should have ………….. than 8 electron in outermost energy level .
    less
  • - Imaginary places around the nucleus in which the electron move according their energy .
    energy levels
  • The number of positive proton in the nucleus .
    atomic number
  • The sum of the number of proton and neutrons in the nucleus
    mass number
  • - The fundamental building unit of matter that can take part in the chemical reaction .
    atom
  • The amount of energy lost or gained when an electron transfer from one energy level to another .
    quantum
  • Electron are particles with ………….. charges , while proton are particles with …………….. charges
    positive - negative
  • The symbol of sodium atom is ………………., while that of sulphur atom is ………………….
    Na - S
  • The number of negative electron that rotate around the nucleus
    atomic n
  • The second energy level (L) is saturated with …………. , while the fourth one (N) is saturated with ……………. electron
    2-36
  • Negatively charged particles of negligible mass that revolve around the nucleus .
    electrons
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