Q. The sum of protons and neutrons in an atom gives off

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Q. The elements which have the same number of protons but different number of neutrons are called

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Q. The proton number is denoted by the symbol

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Q. Particular element posses the same number of electrons hence have the same

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Q. The number of atoms in the same element has the same number of

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Q. Hydrogen has a number of isotopes

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Q. Specific radioactive isotopes are used for

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Q. The mass number is the

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Q. The atom of aluminum (Al) has the number of neutrons (n⁰)

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Q. Down the group the electrical conductivity

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Q. The number of proton, neutron and electron in sulfide ion is respectively

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Q. The number of electrons (e⁻) are always equal to number of protons(p⁺) in a

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Q. The atoms of element convert into ions upon being

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Q. Relative atomic mass for chlorine is

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Q. The mole of a substance is the relative atomic mass or relative molecular mass in terms of

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Q. The instrument which is used to find relative atomic mass of each isotope in an element is called

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Q. The second principal quantum shell can accommodate the number of electrons in numbers

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Q. The electrons (e⁻) of the quantum shells, which are further away from nucleus retain attraction, which is

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Q. The region outside nucleus where electrons (e⁻) revolve is called

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Q. The presence of electrons is shown by three-dimensional shape of orbit with

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