Classification of elements and periodicity in properties practice · Mixed difficulty

Pauling’s equation for determining the electronegativity of an element, is ${X_A},\;{X_B} =$ electronegativity values of elements and $\Delta =$ represents polarity of A-B bond

All elements in the third period have

Which of the following arrangements represents the correct order of electron gain enthalpy (with –ve sign) of the given atomic species?

Which atom has the highest electronegativity?

S-I: The first ionisation energy of $B$ is less than that of ${Be}$

S-II: The penetration ability of s-electrons is higher than that of p-electrons.

The correct answer is

The ionisation energy and electron affinity of an element are 13.0 eV and 3.8 eV resp.
It’s electronegativity is

An atom of an element has electronic configuration $2,8,1$. Which of the following statement is correct?

$\mathrm{I}{\mathrm{P}_2}$ for an element is invariably higher than $\mathrm{I}{\mathrm{P}_1}$ because:

The formation of ${O}^{2-}(\mathrm{g})$ starting from ${O}(\mathrm{g})$ is endothermic by $603 \mathrm{~kJ} \mathrm{~mol}^{-1}$. If electron affinity of ${O}(\mathrm{g})$ is $-141 \mathrm{~kJ} \mathrm{~mol}^{-1}$, the second electron affinity of oxygen would be:

Choose the correct coding for following statements. Here $\mathrm{T}$ stands for True and $\mathrm{F}$ stands for False statement.

(i) Mendeleev left several gaps in his periodic table for the undiscovered elements.

(ii) The gap under aluminium and a gap under silicon was left and these elements were called Eka aluminium and Eka silicon.

(iii) Germanium was placed in place of Eka-aluminium and gallium was placed in place of Eka silicon.

Incorrect statement is/are :

a. Maximum element containing group is third

b. Te is $1^{\text {st }}$ man made radioactive element

c. Law of octave is valid only upto atomic no. 20.

d. Li-Mg pair shows diagonal relationship.

Identify the least stable ion among the following

In which of the following arrangements, the order is NOT according to the property indicated against it

The bond length of LiF will be

The atomic number of element Unp is

Which of the following set of elements follows dobereiner law of triads

The atomic radii of transition elements from $Cr$ to $Cu$ are almost equal because

Among the following oxides, the one which is most basic is

Find the formula of halide of a metal whose successive ionization enthalpies are $x, 2 x, 5 x, 100 x \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively

Arrange the following elements in increasing
order of first ionization enthalpy:

Li, Be, B, C, N, O

Choose the correct answer from the options given
below:

The element which occupies peak of Lother Meyer curve is

An element ' $X$ ' with atomic number 114 has recently been discovered. Its IUPAC name is:

Which of the following properties is inversely related to electronegativity?

The symbol of element with atomic number $Z=109$

The set representing the correct order of first ionisation potential is:

Successive first five ionisation energies of a particular element is 7.1, 14.3, 34.5, 46.8, 162.2 (in eV) respectively. The element is likely to be

The ionization enthalpy will be highest when the electron is to be removed from .............. if other factors are equal :

The five successive ionisation energies of the element are $800,2427,3658,25024$ and $32824 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The number of valence electrons is :

Highest amount of energy will be required for the removal of the electron from

Which of the following groups of elements have highly negative electron gain enthalpy?