Classification of elements and periodicity in properties practice · Mixed difficulty

Assertion(A) Electron gain enthalpy of oxygen is less than that of fluorine but greater than that of nitrogen.

Reason(R) Ionisation enthalpy is as follows: ${N}>{O}>{F}$

Which is not a transition metal?

The element with the electronic configuration as $\left[ {\mathrm{Ar}} \right]3{d^{10}}4{s^2}4{p^3}$ represents a

The longest and shortest periods are

Which of the following relationship proposed graphically by Lothar Meyer?

Pauling’s electronegativity is based on

Alkaline earth metals form ions of the formula:

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

The element with the lowest ionisation potential is

Which of the following is not a member of actinoid series?

Which element has maximum electron affinity?

Assertion : ${Na}^{+}$ and ${Cl}^{-}$ have similar ionic radius.

Reason : ${Z}_{\text {eff}}$ in ${Na}^{+}$ and ${Cl}^{-}$ are same.

The value of $\mathrm{IE}_1, \mathrm{IE}_2, \mathrm{IE}_3$ and $\mathrm{IE}_4$ of an atom are $7.5 \mathrm{~eV}, 25.6 \mathrm{~eV}, 48.6 \mathrm{~eV}$ and $170.6 \mathrm{~eV}$ respectively.
The electronic configuration of the atom will be:-

Which of the following element has less electro negativity

Consider the following elements In, Tl, Al, Pb, Sn and Ge.

The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are

Which of the following elements are found in pitch blende?

Consider the following elements.
${\text{Group}} \downarrow \,_{C'\,D'}^{A'\,B' \to {\text{Period}}}$
Which of the following is/are true about $A^{\prime}, B^{\prime}, C^{\prime}$ and $D^{\prime}$ ?

A. Order of atomic radii: $\mathrm{B}^{\prime} < \mathrm{A}^{\prime} < \mathrm{D}^{\prime} < \mathrm{C}^{\prime}$

B. Order of metallic character: $B^{\prime} < A^{\prime} < D^{\prime} < C^{\prime}$

C. Size of the element: $D^{\prime} < C^{\prime} < B^{\prime} < A^{\prime}$

D. Order of ionic radii : $\mathrm{B}^{\prime+} < \mathrm{A}^{\prime+} < \mathrm{D}^{\prime+} < \mathrm{C}^{\prime+}$

Choose the correct answer from the option given below:

Which among the following elements has highest negative electron gain enthalpy?

The $\mathrm{I}{\mathrm{P}_1}$ is maximum for:

Ionization potential is lowest for:

Maximum I.E is for

Which of the following have the same number of electrons in outermost shell?

Which of the following option is the correct order for the basic strength of metallic hydroxides?

Which among the following element has highest value of second ionization enthalpy?

Assertion : IP of $F$ $>$ EA of $F.$

Reason : ${F}$ is a highly electronegative element.

The electronic configurations for some neutral atoms are given below :

(A) $1 s^2, 2 s^2 2 p^6, 3 s^2$

(B) $1 s^2, 2 s^2 2 p^6, 3 s^1$

(C) $1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^2$

(D) $1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^3$

Which of these is expected to have the highest second ionisation enthalpy?

Which of the following metal is expected to have the highest third ionisation energy ?

Which of the following element has higher ionisation energy?

Identify the elements $X$ and $Y$ using the ionisation energy values given below.
$\begin{array}{cccccccccccccccccccc} {}&{\,\,\,\,\,\,\,\,\mathrm{Ionisation}{\mkern 1mu} {\mkern 1mu} \mathrm{energy}{\mkern 1mu} (\mathrm{Ist})}&{\,\,\,\,\,\,\,\,KJ/mol{\mkern 1mu} {\mkern 1mu} (\mathrm{IInd})}\\ X&{\mathrm{495}}&{\mathrm{4563}}\\ Y&{\mathrm{731}}&{\mathrm{1450}} \end{array}$

Which of the following has the smallest size?