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Which of the following belongs to a representative group of elements of the periodic table?
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Important Questions on Classification of Elements and Periodicity in Properties
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The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is:
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Which element has highest electronegativity?
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Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
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The size of isoelectronic species , and is affected by
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Assertion: Caesium is the most electropositive element in the periodic table.
Reason: Caesium has the lowest first ionisation energy among all the elements.
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Assertion : Electron affinity values of the period elements on extreme right of the periodic table except noble gases are generally more than the period element of the same group.
Reason : Due to smaller atomic size of the period element, its electron density increases which oppose the addition of electron.
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Assertion: Nitrogen (atomic number ) has less electron affinity than the oxygen (atomic number ).
Reason: The magnitude of an element's electron affinity only depends on the element's valence shell electrons configuration.
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Assertion: Second electron gain enthalpy of halogens is always positive.
Reason: Fluorine has maximum value of electron gain enthalpy.
