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

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Q. To determine the mass of another compound by comparing it with the mass of carbon-12 atoms is

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Q. Mr is symbol given for relative

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Q. A method which is used to find the amount of particular substance in a solution is called

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Q. The sum of protons (p⁺) and neutrons (n⁰) in an atom is called its

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Q. Elements of D-block are mainly

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Q. The electronic configuration of chromium is

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Q. Electrons occupy separate orbital within the same sub-shell to reduce

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Q. Whenever there is no empty orbital is available within sub-shell, electrons are

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Q. The specific arrangement of elements in periodic table shows

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Q. The only element which have electronic configuration of 1s² is

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Q. Cl has the electronic configuration of

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Q. Lithium has electrons

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Q. The movement of electrons in transition elements within d-orbital gives

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Q. When electrons (e⁻) are removed from atom, positive ions are

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Q. The removal of 7th electron from an element of Group VI of the periodic table needs three times more energy than

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Q. The removal of electrons one by one from an atom by a specific sequence of ionization energies are termed as

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Q. As the number of proton increases the ionization energy

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Q. Ionization energy is represented by a symbol ΔH1 whose units are

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Q. Successive ionization energy helps us in

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