The outer electronic configuration of $\mathrm{Gd}$ is:

Important Questions on Classification of Elements and Periodicity in Properties

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 35

The correct order of electron gain enthalpy with negative sign of $\mathrm{F}, \mathrm{Cl}, \mathrm{Br}$and $\mathrm{I}$, having atomic number $9,17,35$ and $53$ respectively, is

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 36

The increasing order of the ionic radii of the given isoelectronic species is:

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 37

The first ionisation potential of $\mathrm{Na}$ is $5.1\mathrm{eV}$. The value of electron gain enthalpy of ${\mathrm{Na}}^{+}$ will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 38

Which of the following atoms has the highest first ionisation energy?

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 39

When the first electron gain enthalpy $\left({\mathrm{\Delta H}}_{\mathrm{eg}}\right)$ of oxygen is $-141\mathrm{ }\mathrm{kJ}/\mathrm{mol}$ , its second electron gain enthalpy is:

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 40

In general, the properties that decrease and increase down a group in the periodic table, respectively, are :

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 41

The correct option with respect to the Pauling electronegativity values of the elements is:

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 4>Q 42

The correct order of the atomic radii of $C, Cs, Al,$ and $S$ is: