Classification of elements and periodicity in properties practice · Medium

Electronic configuration of four elements A, B, C and D are given below.
A) $1{S^2}2{S^2}2{P^6}$ B) $1{S^2}2{S^2}2{P^4}$ C) $1{S^2}2{S^2}2{P^6}3{S^1}$ D) $1{S^2}2{S^2}2{P^5}$
Which of the following is the correct order of increasing tendency to gain electron.

The first second and third ionisation energies $\left( {{E_1},{E_2}\,\,and\,\,{E_3}} \right)$ for an element are $7\,\,eV,12.5\,\,eV$ and $42.5\,\,eV$ respectively. The most stable oxidation state of the element will be

Which among the following elements has lowest value of ionisation energy?

For elements B, C, N Li, Be, O and F, the correct order of first ionization enthalpy is

Statement-I: There is regular increase in chemical reactivity from group 1 to group 18 .

Statement-II: Oxides of group-1 elements are basic and oxide of group 17 are acidic

In first 110 elements how many elements having ${e^ - }$ in $5f$ subshell:-

In which of the following arrangements the order is not according to the property indicated against it?

The first ionization potentials $(\mathrm{eV})$ of ${Be}$ and ${B}$ respectively are

Which of the following order is wrong

Electrons are filled into different orbitals and this distribution of electrons into orbitals of an atoms is termed as

Of the following, which one is a correct statement?

Which one of the following is smallest in size

Which of the following transition involves maximum amount of energy

The first four ionisation enthalpies of an element are 191, 678, 872, $6982 \,\mathrm{K} \,\mathrm{cal} \,\mathrm{mol}^{-1}$ respectively. The number of valence electrons in the element is

The electronic configuration of elements A, B and C are $[He] 2 s^1,[{Ne}] 3 s^1$ and $[{Ar}] 4 {s}^1$ respectively. Which one of the following order is correct for the first ionization potentials (in $\mathrm{kJ} \mathrm{mol}{ }^{-1}$) of A, B, C?

Which of the following orders of radii is correctly represented?

The enthalpy change accompanying in the given reaction, $X(g)+e^{-} \longrightarrow X^{-}(g)$ is defined as

Which of the following oxide is neutral

Which is mismatched regarding the position of the element as given below?

What effect is observed, on the size of an atom when an electron is removed and in another case when an electron is added to the same atom?

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

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

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

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.

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

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

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: