Q. First element in periodic table to have 8 valence electrons in third shell is

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Q. Isotopes have similar

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Q. Extra stability is gained in third shell if number of electrons are

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Q. Isotopes of same element have

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Q. Valence electrons are used to get a clue of

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Q. An electron has a

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Q. In Hydrogen (H), number of neutrons is

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Q. If number of electrons in chlorine are 17, number of shells required will be

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Q. If nucleon and proton number of manganese is 24 and 12 respectively, number of electrons and protons will be

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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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