Which element has the lowest electronegativity?

Important Questions on Periodic Properties and Variations of Properties – Physical and Chemical

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The most electronegative element from the following elements is:

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Given that ionization potential and electron gain enthalpy of chlorine are $13\mathrm{eV}$ and $4\mathrm{eV}$ respectively. The electronegativity of chlorine on Mulliken scale, approximately equals to

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Most electronegativity element in the periodic table

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The formation of the oxide ion, ${\mathrm{O}}^{2-}\left(\mathrm{g}\right)$ , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

$\mathrm{O}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{-}\left(\mathrm{g}\right)\mathrm{ }\mathrm{ }\mathrm{ };\mathrm{ }\mathrm{ }{\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{H}}^{\ominus }=-141\mathrm{ }\mathrm{k}\mathrm{J}\mathrm{ }\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

${\mathrm{O}}^{-}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{2-}\mathrm{ }\left(\mathrm{g}\right)\mathrm{ };\mathrm{ }\mathrm{ }{\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{H}}^{\ominus }=+780\mathrm{ }\mathrm{k}\mathrm{J}\mathrm{ }\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

Thus process of formation of ${\mathrm{O}}^{2-}$ in gas phase is unfavourable though ${\mathrm{O}}^{2-}$ is isoelectronic with neon. It is due to the fact that,

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The first ionization enthalpies of $\mathrm{Be}, \mathrm{B}, \mathrm{N}$ and $\mathrm{O}$ follow the order

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For ${\mathrm{Na}}^{+}, {\mathrm{Mg}}^{2+},\mathrm{ }{\mathrm{F}}^{-}$ and ${\mathrm{O}}^{2-}$, the correct order of increasing ionic radii is:

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Which of the following indicates the correct variation in eletronegativities?

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodic Properties and Their Variation in Groups and Periods

Which element has the highest first ionization potential?

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The electronegativities of $N, C, Si$ and $P$ are in the order -

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodic Properties and Their Variation in Groups and Periods

Identify the correct order of electronegativity for $\mathrm{Mg},\mathrm{B},\mathrm{Si}$ and $\mathrm{S}$.

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodic Properties and Their Variation in Groups and Periods

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na ⁺ will be :

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The correct order of atomic radii is:

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

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The correct order of electronegativity for given elements is

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodic Properties and Their Variation in Groups and Periods

The effective nuclear charge of an element with three valence electrons is $2.60$ . What is the atomic number of the element?

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Among the element Li, N, C and Be, one with the largest atomic radius is

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodic Properties and Their Variation in Groups and Periods

The first ionization enthalpies for three elements are $1314, 1680$ and $2080\mathrm{ }\mathrm{kJ}\mathrm{ }{\mathrm{mol}}^{-1}$ , respectively. The correct sequence of the element is:

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodic Properties and Their Variation in Groups and Periods

The electronegativity of the given elements increases in the order

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The species $\mathrm{A}\mathrm{r},\mathrm{ }{\mathrm{K}}^{+}$ and $\mathrm{C}{\mathrm{a}}^{2+}\mathrm{ }$ contain the same number of electrons. In which order do their radii increase?

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodic Properties and Their Variation in Groups and Periods

Identify the element that forms amphoteric oxide: