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Classification of Elements and Periodicity in Properties

Short Answer Type

121.
Define ionsiation enthalpy. State its units.

Ionisation enthalpy is the minimum amount of enthalpy required to remove most loosely held electron from an isolated gaseous atom in its ground state.

Atom (g) + Ionisation enthalpy

Positive ion (g) + electron (g) Na (g) + IE(496 kJ)

Na⁺(g) + e^-It is expressed either in terms of electron volts per atom (eV/atom) or kilo joules per mole of atoms (kJ mol-1). The two units are related as 1eV per atom = 96.3 kJ mol-1

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Long Answer Type

122.

What are successive ionisation enthalpies? Explain why the second ionisation enthalpy is higher than the first ionisation enthalpy?

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123.

Discuss in brief the factors which influence the magnitude of ionsiation enthalpy.

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Short Answer Type

124.

How does ionisation enthalpy vary along a group?

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125.

What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down a group?

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126.

Why does the first ionsiation enthalpy increase as we go from left to right through a period of the periodic table?
Or
How does ionisation enthalpy vary along a period?

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