Classification of elements and periodicity in properties practice · Medium

First and second ionisation energies of magnesium are 7.646 and $15.035 \mathrm{eV}$ respectively. The amount of energy in $\mathrm{kJ}$ needed to convert all the atoms of magnesium into $\mathrm{Mg}^{2+}$ ions present in $12 \mathrm{mg}$ of magnesium vapours is :

[Given : $1 \mathrm{eV}=96.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$ ]

Which of the following process requires largest amount of energy

The metallic radius of sodium is $1.86\,\,\mathop \mathrm{A}\limits^\mathrm{o} ,$ where as its cation radius from its vapour state is

Regarding electron gain enthalpy (magnitude) the correct relation is

A) ${S}>{Se}>{Te}>{O}$

B) ${Cl}>{Br}>{F}>{I}$

C) ${Ne}>{Ar}>{Xe}>{He}$

Which of the following groups in modern periodic table have largest number of elements

Which of the following statements is correct regarding Newlands's law of Octaves?

Select the correct statement

Which among the following elements have largest value of 3rd IP.

Which of the following possess positive electron gain enthalpy?

Which has the highest ionization energy for the removal
of the second electron?

Amongst the following elements the configuration having the highest ionization energy is:

The elements with atomic numbers 101 and 104 belong to, respectively,

Assertion (A): ${Na}^{+}$ and ${Al}^{3+}$ are isoelectronic species.
Reason (R): $Na$ belongs to $s$-block, while ${Al}$ belongs to $p$-block.

Second electron gain enthalpy

Which of the following statements is wrong ?

Mendeleev corrected the atomic mass of:

Given below are two statements.

Statement – I: Negative electron gain enthalpy of fluorine is greater than chlorine.

Statement – II: Ionisation enthalpy of fluorine is less than chlorine.

In the light of above statements, choose the most appropriate answer from the options given below.

Assertion : Ionisation potential of $\mathrm{Li}^{+}$ is greater than $\mathrm{He}$.

Reason : $\mathrm{Z}_{\text {eff}}$ of $\mathrm{Li}^{+}$ is greater than $\mathrm{He}$.

Given below are two statements:
Statement I: The pentavalent oxide of group-15 element, ${E_2}{O_5}$, is less acidic than trivalent oxide, ${E_2}{O_3}$, of the same element.
Statement II: The acidic character of trivalent oxide of group 15 elements, ${E_2}{O_3}$, decreases down the group.
In light of the above statements, choose most appropriate answer from the options given below:

The electronic configuration having maximum difference in first and second ionization energies is

Assertion : Hydrated ionic radius of $\mathrm{Li}^{+}$ is maximum in IA group elements.

Reason : Lithium is a metal.

The radii of $\mathrm{F}_2 \mathrm{~F}^{-}, \mathrm{O}$ and $\mathrm{O}^{2-}$ are in the order

An element, which belongs to third period and group 16 in the periodic table has electronic configuration.

The correct electron affinity order of $N,\,\,O,\,\,S,\,\,Cl$ is

Electronic configurations of four elements A, B, $\mathrm{C}$ and $\mathrm{D}$ are given below :

(i) $1 s^2 2 s^2 2 p^6$

(ii) $1 s^2 2 s^2 2 p^4$

(iii) $1 s^2 2 s^2 2 p^6 3 s^1$

(iv) $1 s^2 2 s^2 2 p^5$

Which of the following is the correct order of increasing tendency to gain electron?

The atomic number of the element unnilennium is

Arrange N, O and S in order of decreasing electron affinity

Which of the following transition involves maximum amount of energy

The electronic configuration of inner transition elements is

The electron density between 1s and 2s is