Classification of elements and periodicity in properties practice · Mixed difficulty

If electronegativity of $x$ be 3.2 and that of $y$ be 2.2 , the percentage ionic character of $x y$ is -

Predict the correct formula of compounds, by the following pair of elements like aluminium and sulphur with the help of oxidation states,

Positive electron gain enthalpy is highest for

Differentiating electron in inner transition elements enters the………….. orbital.

In which one of the following pairs the radius of the second species is greater than that of the first?

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

An element with atomic number 59 belongs to

All elements in the third period have

Diagonal relationship is for

The element whose electronic configuration is $1{s^2},2{s^2},2{p^6},3{s^2}$ is:

Predict the period, group and block of an element having electronic configuration $1 s^2 2 s^2 2 p^6 3 s^2 3 p^4$.

Out of $Ne,\,\,N{a^ + },\,\,O,\,\,Na$ and $N,$ the species having maximum and minimum ionization energies respectively are

The starting element of fourth period is

Which one these basic

The element with atomic number 35 belongs to :

$\mathrm{N}{\mathrm{a}_2}\mathrm{O},\mathrm{\;MgO},\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3}\mathrm{\;and\;Si}{\mathrm{O}_2}\mathrm{\;}$ have heat of formation equal to $- 416, - 602, - 1676\;$ and $- 911\mathrm{\;kJ\;mo}{\mathrm{l}^{ - 1}}$ respectively. The most stable oxide is

The basic character of $\mathrm{MgO}, \mathrm{BaO}, \mathrm{Na}_2 \mathrm{O}$ and $\mathrm{FeO}$ follow the order

Select the incorrect order of size of ion/atoms

What is the atomic number of the next halogen if discovered?

The correct order of ionisation energy for comparing carbon, nitrogen and oxygen atom is

If the differentiating electron enters (n-1)d – subshell, the element is

Given below are two statements:
Statement I $Ce{O_2}$ can be used for oxidation of aldehydes and ketones.
Statement II Aqueous solution of $EuS{O_4}$ is a strong reducing agent.
In the light of the above statements, choose the correct answer from the options given below.

A plot of $\sqrt{v}$ (frequency) against atomic number $(z)$ gave a :

The tenth elements in the Periodic Table resembles with the

Which of the following configuration has strongest metallic bonding?

The energy released when a neutral gaseous atom takes up an electron is called:

Which of the following is a false statement?

To which block of the periodic table does element with atomic number 55 belong

Set of isoelectronic species is

Variable oxidation state and degenerated orbital shows