Q. Mass of an electron is

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Q. Mass of a proton is equal to that of mass of

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Q. Subtracting proton number from nucleon number,

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Q. Number of electrons in calcium are 20. outermost shall will have as many as

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Q. Period number indicates the

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Q. Helium (He) is not an inert gas because

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Q. Carbon-12 is chosen as standard atom because

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Q. Same number of shells are found in elements of

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Q. If n=1, maximum number of electrons in a shell can be recalled through formulae

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Q. If nucleon and neutron numbers are 27 and 14 respectively, number of electrons will be

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Q. If nucleon number of fluorine is 19, proton number will be

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Q. If nucleon and proton number of argon is 40 and 18 respectively, respective number of electrons and neutrons will be

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Q. Nucleon number of an element is equal to the

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Q. Full shell of valence electrons make

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Q. Energy levels of electrons are also called as

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Q. Inert gases have

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Q. Proton number of Fluorine (F) is 9, electron number is

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Q. In periodic table, number of valence electron is one, in

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Q. Elements and their isotopes have different

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Q. In tritium, number of neutrons is

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