Periodic Table and Periodicity

Match the following$$ \begin{array}{llll} \hline & \text { List-I (Element) } & & \text { List-II (Block) } \\ \hline \text { (A) } & \mathrm{Cd} & \text { I } & f \text {-block } \\ \hline \text { (B) } & \mathrm{Eu} & \text { II } & s \te...

In long form of periodic table an element ' $E$ ' has atomic number 78 . The period and group number of the element are $x$ and $y$ respectively. $(x+y)$ is equal to

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$$ \begin{array}{cccc} \hline & \text { List-I (Elements) } & & \text { List-II (Group) } \\ \hline \text { A } & \mathrm{Mn}, \mathrm{Tc}, \mathrm{Re} & \text { I } & 12 \\ \hline \text { B } & \mathrm{Z...

Identify the correct orders regarding atomic radii
(i) $\mathrm{Cl}>\mathrm{F}>\mathrm{Li}$
(ii) $\mathrm{P}>\mathrm{C}>\mathrm{N}$
(iii) $\mathrm{Tm}>\mathrm{Sm}>\mathrm{Eu}$
(iv) $\mathrm{Sr}>\mathrm{Ca}>\mathrm{Mg}$

Observe the following data ( $\Delta_t H_1, \Delta_t H_2$ and $\Delta_{\mathrm{eg}} H$ represent the first, second ionisation enthalpies and electron gain enthalpy respectively)


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In second period of the modern periodic table, two elements $X$ and $Y$ have higher first ionisation enthalpy values than the preceding and succeeding elements. $X$ and $Y$ are respectively

Observe the following oxides. The number of amphoteric oxides from the given list is $\mathrm{CO}, \mathrm{B}_2 \mathrm{O}_3, \mathrm{SnO}_2, \mathrm{PbO}_2, \mathrm{Ga}_2 \mathrm{O}_3, \mathrm{SnO}, \mathrm{PbO}, \mathrm{CO}_2$

The correct order of atomic radii of group 13 elements is

$A, B C, D$ and $E$ are elements with atomic numbers 13 , $11,9,7$ and 16 respectively. Among these elements, ion of an element $X$ has largest size and ion of an element $Y$ has smallest size. $X$ and $Y$ are respectively.(Assume that all ...

In which of the following options, elements are correctly arranged in the increasing order of their atomic radius?

Atomic numbers of three elements $E_1, E_2$ and $E_3$ of periodic table are $Z_1, 50$ and $Z_2$ respectively. From the position of the elements shown in figure, the values of $\left(Z_2-Z_1\right)$ is

Electron gain enthalpy values $\left(\Delta_{\mathrm{cg}} H\right)$ (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of elements $X, Y$ and $Z$ are $-349,-200$ and -295 respectively. $X, Y$ and $Z$ are respectively

Identify the pair of element in which the number of $s$-electrons to $p$-electrons ratio is $2: 3$

Which of the following has the least electron gain enthalpy?

Match the following.

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Identify the pair of elements in which the difference in atomic radii is maximum

In which of the following species, the ratio of $s$-electrons to $p$-electrons is same?

If first ionisation enthalpy $\left(\Delta_{i} H\right)$ values of $\mathrm{Na}, \mathrm{Mg}$ and Si are respectively 496,737 and $786 \mathrm{~kJ} \mathrm{~mol}^{-1}$, the first ionisation enthalpy value of $\mathrm{Al}\left(\mathrm{in} \m...

In which of the following ionic pairs, second ion is smaller in size than the first ion?

The set containing the elements with positive electron gain enthalpies is

Assertion (A) : The ionic radii of $\mathrm{Na}^{+}$and $\mathrm{F}^{-}$are same.
Reason (R) : Both $\mathrm{Na}^{+}$and $\mathrm{F}^{-}$are isoelectronic species.
The correct answer is

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$$ \begin{array}{cccc} \hline & \begin{array}{c} \text { List-I } \\ \text { (Atomic number) } \end{array} & & \begin{array}{c} \text { List-II } \\ \text { (Group number and } \\ \text { period number) ...

Tha atomic radius of gallium is less than that of aluminium. This is due to

Assertion (A) First ionisation enthalpy of oxygen is less than that of nitrogen.
Reason (R) Atoms with half-filled or completely filled orbitals are less stable.
The correct option among the following is

Choose the correct order of second ionisation enthalpies of carbon, nitrogen, oxygen and fluorine.

What is the correct order with respect to metallic property of Zr, Cd, Sn, Sr?

Identify the correct statements from the following.
(I) Au is soluble in aqua regia but not Pt .
(II) Among the oxoacids of chlorine highest oxidation state possible for chlorine is +7 .
(III) Among the hydrogen halides lowest boiling point...

Consider the following.
(I) The order of first ionisation enthalpy of first three elements of 3rd period is $\mathrm{Mg}>\mathrm{Al}>\mathrm{Na}$.
(II) The element with electronegativity of 3.5 is chlorine.
(III) The order of sizes of ions ...

In which of the following options, the elements are correctly arranged with respect to their negative electron gain enthalpies?

In group 13 of the long form of periodic table an element $X$ has a boiling point of $T_2(\mathrm{~K})$ and melting point of $T_1(\mathrm{~K})$. Identify the element $X$ for which $T_2-T_1(\mathrm{~K})$ is maximum

Arrange the following in increasing order of ionic radii
\(\mathrm{O}^{2-}, \mathrm{Na}^{+}, \mathrm{F}^{-}, \mathrm{Mg}^{2+}\)

Which of the following species are isoelectronic species?
(A) $\mathrm{O}^{2-}$
(B) $\mathrm{F}^{-}$
(C) $\mathrm{Na}^{+}$
(D) $\mathrm{Mg}^{2+}$

Which of the following sequence is correct for decreasing order of ionic radius?

Assertion (A) The ionic radii of the alkaline earth metals are smaller than those of alkali metals in the same period.
Reason (R) Alkali metals have higher nuclear charge than that of the alkaline earth metals.
The correct option among the ...

The successive ionisation energies (starting from the 1 st ) of an element are $801,2430,3660,25,000$ and $32,800 \mathrm{~kJ} \mathrm{~mol}^{-1}$, respectively. The element is

The correct order of the electron gain enthalpy of the given elements is

The correct order of ionic radii for the given species is

Which of the following set of properties generally decreases along a period?

How many of the following statements are correct?
(A) ' $\mathrm{He}^{\prime}$ ' is the second most abundant element in the universe.
(B) The symbol for the element with atomic number 110 is Ds.
(C) Osmium has the highest density among all ...

The correct order of the first ionisation enthalpies of the following elements is

The correct order of decreasing acidic nature of oxides is

What is the correct order of atomic radius of $\mathrm{Al}, \mathrm{Na}, \mathrm{B}$ and Be ?

Arrange the following ions in the correct order with respect to their ionic radii.

Among the following, the pair of elements having same electronegativity values are
I. H and $\mathrm{P} \quad$ II. Be and Al III. N and $\mathrm{Cl} \quad$ IV. C and P

Which of the following pairs shows diagonal relationship?

The basic difference in approach between Mendeleev's periodic law and modern periodic law is the change on the basis of classification of elements from

The successive ionisation energy values for an element ' $X$ ' are given below :
(i) 1st ionisation energy $=410 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(ii) 2nd ionisation energy $=820 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(iii) 3rd ionisation energy ...

Assertion (A) $\mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ are isoelectronic but the magnitude of ionic radius of $\mathrm{Al}^{3+}$ is less than that in $\mathrm{Mg}^{2+}$.
Reason (R) The effective nuclear charge on the outermost electrons in...

Based on the quantum numbers, what will be the maximum number of element for sixth period of the periodic table?