Periodic Table and Periodicity

\(\text { Observe the following data : }\)
$$ \begin{array}{lllll} \hline \text { Ion } & Q^{a+} & X^{b+} & Y^{c+} & Z^{\alpha+} \\ \hline \text { Radius (pm) } & 53 & 66 & 40 & 100 \\ \hline \end{array} $$
$Q^{a+}, X^{b+}, Y^{c+}, Z^{d+}...

Among the ions $\mathrm{Mg}^{2+}, \mathrm{O}^{2-}, \mathrm{Al}^{3+}, \mathrm{F}^{-}, \mathrm{Na}^{+}$and $\mathrm{N}^{3-}$, the ion with largest size and ion with smallest size are respectively

Which of the following orders is not correct for the given property?

The order of negative electron gain enthalpy of $\mathrm{Li}, \mathrm{Na}$, $\mathrm{S}, \mathrm{Cl}$ is

Electronic configurations of four elements $A, B, C, D$ are given below
(A) $1 s^2 2 s^2 2 p^6 3 s^1$
(B) $1 s^2 2 s^2 2 p^6 3 s^2 3 p^1$
(C) $1 s^2 2 s^2 2 p^6 3 s^2$
(D) $1 s^2 2 s^2 2 p^6 3 s^2 3 p^2$
The correct order of first ionisatio...

The period and group numbers of the element having maximum electronegativity in the long form of periodic table respectively, are

The correct order of atomic radii of $\mathrm{C}, \mathrm{Al}$ and S is

Identify the incorrect order against the stated property.

The correct order of the non-metallic character among the elements $\mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{F}$ and Si is

Which of the following orders is not correct about the property shown against it?

\(\text { Match the following }\)$$ \begin{array}{lllc} \hline & \text { List-I (Atomic number; Z) } & & \text { List-II (Block) } \\ \hline \text { A } & 112 & \text { I } & \text { s } \\ \hline \text { B } & 116 & \text { II } & \text ...

\(\text { Match the following. }\)

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In which of the following sets, elements are not correctly arranged with the property shown in brackets?

Two statements are given below.
Statement I : Nitrogen has more ionisation enthalpy and electronegativity than beryllium.
Statement II : $\mathrm{CrO}_3, \mathrm{~B}_2 \mathrm{O}_3$ are acidic oxide.
Correct answer is

The correct order of atomic radii of given element is

The correct order of atomic radii of $\mathrm{N}, \mathrm{F}, \mathrm{Al}, \mathrm{Si}$ is

Which of the following oxides is acidic in nature?

\(\text { Match the following. }\)

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Which of the following orders is not correct against the given property?

If the first ionisation enthalpy of $\mathrm{Li}, \mathrm{Be}$ and C respectively are $520,899,1086 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The first ionisation enthalpy (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of B will be

Identify the basic oxide from the following.

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Identify the pair of elements with the highest and lowest electronegativity respectively

Consider the following two statements.
Statement I Among $\mathrm{Mg}, \mathrm{Al}, \mathrm{Mg}^{2+}, \mathrm{Al}^{3+}$ the one having smallest size is $\mathrm{Al}^{3+}$.
Statement II Eu is having exceptionally high atomic radii among lant...

The first ionisation enthalpies of $\mathrm{Na}, \mathrm{Mg}$ and Si are respectively 496, 737 and $786 \mathrm{~kJ} \mathrm{~mol}^{-1}$. What would be the first ionisation enthalpy of Al in $\mathrm{kJ} \mathrm{mol}^{-1}$ ?

The correct order of covalent radii of $\mathrm{Si}, \mathrm{Ge}, \mathrm{Sn}$ is

Assertion (A) Fluorine has smaller negative electron gain enthalpy than chlorine.
Reason (R) The electron-electron repulsion is higher in chlorine than in fluorine.

Assertion (A) 16 th group elements have higher ionisation enthalpy values than 15 th group elements in the corresponding periods.
Reason (R) 15 th group elements have half-filled stable electronic configurations.

In which of the following oxides of three elements \(X, Y\) and \(Z\) are correctly arranged in the increasing order of acidic nature. The electronic configurations of \(X, Y\) and \(Z\) are $$[\mathrm{Ne}] 3 s^2 3 p^1, [\mathrm{Ne}] 3 s^2 ...

Which of the following tetrahalides does not exist?

The correct order of the metallic character of the elements \(\mathrm{Be}, \mathrm{Al}, \mathrm{Na}, \mathrm{K}\) is

Lithium shows diagonal relationship with element '\(X\)' and aluminium with \(Y . X\) and \(Y\) respectively are

In which of the following, elements are arranged in the correct order of their electron gain enthalpies?

In second period of the long form of the periodic table an element \(X\) has second lowest first ionisation enthalpy and element \(Y\) has second highest first ionisation enthalpy values. What are \(X\) and \(Y\) ?

Which of the following statements is/are correct?
1. Mercury is the only metal that exists as liquid at room temperature.
2. Among non-metals, carbon has the highest melting point.
3. Hydrogen is the most abundant element in the universe.
4...

The first ionisation enthalpies of \(\mathrm{Mg}\) and \(\mathrm{Al}\) can be expected to be ............ .

The electronegativity of the given elements
increases in the order.

Which of the following represents the correct
order of increasing electron gain enthalpy
with negative sign for the elements?
1. Nitrogen (N) 2. Phosphorus (P) 3. Chlorine (Cl) 4. Fluorine (F)

Which statements among the following are correct about helium?
(i) Liquid helium is used to sustain powerful superconducting magnets.
(ii) Liquid helium is useful to carry low temperature experiments.
(iii) It is a heavy gas.
(iv) It is a f...

Among the given configurations, identify the element which does not belong to the same family as the others?

Choose the correct option regarding the following statements
Statement 1 Nitrogen has lesser electron gain enthalpy than oxygen.
Statement 2 Oxygen has lesser ionisation enthalpy than nitrogen.

The element with outer electronic configuration \((n-1) d^2 n s^2\), where \(n=4\), would belong to