gr 7 revision atomic structure | Baamboozle - Baamboozle

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atomic structure

Study Slideshow

The symbol of sodium atom is ………………., while that of sulphur atom is ………………….

Na - S

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The mass number is the sum of ……………… number and …………., which exist in the nucleus .

protons neutrons

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Electron are particles with ………….. charges , while proton are particles with …………….. charges

positive - negative

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The second energy level (L) is saturated with …………. , while the fourth one (N) is saturated with ……………. electron

2-36

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-Active element should have ………….. than 8 electron in outermost energy level .

less

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- The fundamental building unit of matter that can take part in the chemical reaction .

atom

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The number of positive proton in the nucleus .

atomic number

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The sum of the number of proton and neutrons in the nucleus

mass number

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The number of negative electron that rotate around the nucleus

atomic n

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Negatively charged particles of negligible mass that revolve around the nucleus .

electrons

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- Imaginary places around the nucleus in which the electron move according their energy .

energy levels

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The amount of energy lost or gained when an electron transfer from one energy level to another .

quantum

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