Q. In which period decrease of atomic radii is very prominent?

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Q. Number of electrons in valence shell of first element of period is

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Q. From top to bottom in a group of periodic table atomic radii

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Q. In a group of periodic table, nuclear charge

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Q. Electron affinity of sodium atom is

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Q. Force of which ultimately results in difficult removal of electron is

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Q. Atomic number of sodium is

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Q. In group from top to bottom electron affinity

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Q. Increase in atomic number is leads to a stronger force of attraction between nucleus and increasing number of

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Q. Covalent radius of hydrogen is

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Q. Electron affinity of chlorine is

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Q. Electro negativity is related to ionization energy of element and

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Q. Electron affinity of hydrogen atom is

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Q. Important part of atom which is related to many physical and chemical properties is its

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Q. Negative sign is given to electron affinity because energy is

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Q. Force which hold atoms or ions together is

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Q. Energy needed to detach an electron form potassium atom is equal to its

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Q. Energy of an element which is required to remove an electron from its gaseous atom, to form an ion is

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Q. First ionization energy of potassium is

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Q. Ionization energy which is required to remove third electron after removal of second electron is

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