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gr 7 revision atomic structure
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The amount of energy lost or gained when an electron transfer from one energy level to another .
quantum
- Imaginary places around the nucleus in which the electron move according their energy .
energy levels
Negatively charged particles of negligible mass that revolve around the nucleus .
electrons
The number of negative electron that rotate around the nucleus
atomic n
The sum of the number of proton and neutrons in the nucleus
mass number
The number of positive proton in the nucleus .
atomic number
- The fundamental building unit of matter that can take part in the chemical reaction .
atom
-Active element should have ………….. than 8 electron in outermost energy level .
less
The second energy level (L) is saturated with …………. , while the fourth one (N) is saturated with ……………. electron
2-36
Electron are particles with ………….. charges , while proton are particles with …………….. charges
positive - negative
The mass number is the sum of ……………… number and …………., which exist in the nucleus .
protons neutrons
The symbol of sodium atom is ………………., while that of sulphur atom is ………………….
Na - S
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