Single Choice

In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens). Which properties of these two groups are responsible for this?

ALeast ionisation enthalpy on the left and highest negative electron gain enthalpy on the right.
Correct Answer
BNon-metallic character on the left and metallic character on the right.
CSmall atomic radii on the left and high atomic radii on the right.
DHighest electronegativity on the left and least electronegativity on the right.

Solution

High chemical reactivity of alkali metals is due to low ionisation energies. Alkali metals readily lose an electron and form cation with stable noble gas electronic configuration. High chemical reactivity of halogens is due to high negative electron gain enthalpies. Halogens readily accept an electron and form anion with stable noble gas electronic configuration.

SIMILAR QUESTIONS

Periodic Classification of Elements

The third ionization enthalpy is minimum for :

Periodic Classification of Elements

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are:

Periodic Classification of Elements

Which of the following represents the correct order of increasing first ionization enthalpy for $$Ca$$, $$Ba$$, $$S$$, $$Se$$ and $$Ar$$?

Periodic Classification of Elements

In which of the following options the order of arrangement does not goes with the variation of property indicated against it?

Periodic Classification of Elements

Compare the alkali metals and alkaline earth metals with respect to (i) ionisation enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.

Periodic Classification of Elements

The element having very high ionization enthalpy but zero electron gain enthalpy is :

Periodic Classification of Elements

The first ionisation potential of $$Na, Mg, Al$$ and $$Si$$ are in the order:

Periodic Classification of Elements

In which of the following transformation least energy is required?

Periodic Classification of Elements

Which of the following electronic configuration is associated with the biggest jump between the second and third ionization energies?

Periodic Classification of Elements

For which of the following reaction $$\Delta H^\circ$$ value is equal to the first ionization energy of Ca is?

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