Periodic Table and Periodic Properties

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JEE Advanced 2026

LEVELJEE Main

The correct statement(s) regarding the periodic properties of elements is (are)

* Multiple Correct Options

(A)

Second ionization enthalpy of carbon atom is less than that of boron atom

(B)

Increasing order of ionic radii:

Al^{3 +} < Mg^{2 +} < Na^{+}

(C)

Under identical conditions, in solid state, the density of potassium metal is more than density of sodium metal

(D)

The H–H bond is weaker than F–F bond.

JEE Advanced 2016

LEVELJEE Main

The increasing order of atomic radii of the following group 13 elements is

The option(s) with only amphoteric oxides is (are):

* Multiple Correct Options

(A)

Cr_{2} O_{3}

CrO

SnO

PbO

(B)

NO

B_{2} O_{3}

PbO

SnO_{2}

(C)

Cr_{2} O_{3}

BeO

SnO

SnO_{2}

(D)

ZnO

Al_{2} O_{3}

PbO

PbO_{2}

JEE Main 2020

LEVELJEE Advanced

The $1^{st}$ , $2^{nd}$ and the $3^{rd}$ ionization enthalpies $I_{1}$ , $I_{2}$ and $I_{3}$ , of four atoms with atomic numbers $n$ , $n + 1$ , $n + 2$ and $n + 3$ , where $n < 10$ , are tabulated below. What is the value of $n$ ?

JEE Main 2019

LEVELJEE Main

In comparison to boron, beryllium has

(A)

lesser nuclear charge and lesser first ionisation enthalpy

(B)

greater nuclear charge and lesser first ionisation enthalpy

(C)

greater nuclear charge and greater first ionisation enthalpy

(D)

lesser nuclear charge and greater first ionisation enthalpy

JEE Main 2020

LEVELJEE Main

The correct order of the ionic radii of $O^{2 -}$ , $N^{3 -}$ , $F^{-}$ , $Mg^{2 +}$ , $Na^{+}$ and $Al^{3 +}$ is

(A)

N^{3 -} < O^{2 -} < F^{-} < Na^{+} < Mg^{2 +} < Al^{3 +}

(B)

Al^{3 +} < Na^{+} < Mg^{2 +} < O^{2 -} < F^{-} < N^{3 -}

(C)

Al^{3 +} < Mg^{2 +} < Na^{+} < F^{-} < O^{2 -} < N^{3 -}

(D)

N^{3 -} < F^{-} < O^{2 -} < Mg^{2 +} < Na^{+} < Al^{3 +}

JEE Main 2019

LEVELBoard

The IUPAC symbol for the element with atomic number 119 would be

The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are, respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionisation enthalpy?

The set of elements that differ in mutual relationship from those of the other sets is

The process that is not endothermic in nature is

(A)

O^{-} (g) + e^{-} \to O^{2 -} (g)

(B)

N a (g) \to N a^{+} (g) + e^{-}

(C)

H (g) + e^{-} \to H^{-} (g)

(D)

A r (g) + e^{-} \to A r^{-} (g)

JEE Main 2020

LEVELJEE Main

The process that is not endothermic in nature is

(A)

O^{-} (g) + e^{-} ⟶ O^{2 -} (g)

(B)

N a (g) ⟶ N a^{+} (g) + e^{-}

(C)

H (g) + e^{-} ⟶ H^{-} (g)

(D)

A r (g) + e^{-} ⟶ A r^{-} (g)

JEE Main 2019

LEVELJEE Main

In general, the properties that decrease and increase down a group in the periodic table, respectively are

(A)

electronegativity and atomic radius

(B)

electronegativity and electron gain enthalpy

(C)

electron gain enthalpy and electronegativity

(D)

atomic radius and electronegativity

JEE Main 2020

LEVELJEE Main

The ionic radii of $O^{2 -}, F^{-}, N a^{+}$ and $M g^{2 +}$ are in the order

(A)

O^{2 -} > F^{-} > M g^{2 +} > N a^{+}

(B)

M g^{2 +} > N a^{+} > F^{-} > O^{2 -}

(C)

O^{2 -} > F^{-} > N a^{+} > M g^{2 +}

(D)

F^{-} > O^{2 -} > N a^{+} > M g^{2 +}

LEVELJEE Main

The formation of the oxide ion $O^{2 -} (g)$ requires first an exothermic and then an endothermic step as shown below $O (g) + e^{-} = O^{-} (g); Δ H^{\circ} = - 142 kJ mol^{- 1}$ $O^{-} (g) + e^{-} = O^{2 -} (g); Δ H^{\circ} = 844 kJ mol^{- 1}$ This is because

(A)

oxygen is more electronegative

(B)

oxygen has high electron affinity

(C)

O^{-}

ion will tend to resist the addition of another electron

(D)

O^{-}

ion has comparatively larger size than oxygen atom

LEVELBoard

According to the periodic law of elements, the variation in properties of elements is related to their

nuclear neutron-proton number ratios

JEE Main 2016

LEVELJEE Main

Which of the following atoms has the highest first ionisation energy?

Which one of the following order represents the correct sequence of the increasing basic nature of the given oxides?

(A)

M g O < K_{2} O < A l_{2} O_{3} < N a_{2} O

(B)

N a_{2} O < K_{2} O < M g O < A l_{2} O_{3}

(C)

K_{2} O < N a_{2} O < A l_{2} O_{3} < M g O

(D)

A l_{2} O_{3} < M g O < N a_{2} O < K_{2} O

JEE Main 2021

LEVELJEE Main

Identify the elements $X$ and $Y$ using the ionisation energy values given below. $\begin{array}{lcc} & \text{Ionisation energy (Ist)} & \text{kJ/mol (IInd)} \\ X & 495 & 4563 \\ Y & 731 & 1450 \end{array}$

(A)

X = Na, Y = Mg

(B)

X = Mg, Y = F

(C)

X = Mg, Y = Na

(D)

X = F, Y = Mg

JEE Main 2020

LEVELJEE Main

B has a smaller first ionisation enthalpy than Be. Consider the following statements : (I) It is easier to remove $2 p$ electron than $2 s$ electron (II) $2 p$ electron of B is more shielded from the nucleus by the inner core of electrons than the $2 s$ electrons of Be (III) $2 s$ electron has more penetration power than $2 p$ electron (IV) atomic radius of B is more than Be (atomic number B = 5, Be = 4) The correct statements are

The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is

The size of the iso-electronic species $Cl^{-}$ , $Ar$ and $Ca^{2 +}$ is affected by

(A)

azimuthal quantum number of valence shell

(B)

electron-electron interaction in the outer orbitals

(C)

principal quantum number of valence shell

The set in which compounds have different nature is

(A)

B(OH)_{3}

and

H_{3} PO_{3}

(B)

B(OH)_{3}

and

Al(OH)_{3}

(C)

NaOH

and

Ca(OH)_{2}

(D)

Be(OH)_{2}

and

Al(OH)_{3}

JEE Main 2019

LEVELJEE Main

The group number, number of valence electrons and valency of an element with atomic number 15, respectively, are

The correct statement(s) regarding the periodic properties of elements is (are)

The increasing order of atomic radii of the following group 13 elements is

The option(s) with only amphoteric oxides is (are):

In comparison to boron, beryllium has

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct order of the ionic radii of O2−, N3−, F−, Mg2+, Na+ and Al3+ is

The IUPAC symbol for the element with atomic number 119 would be

The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are, respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionisation enthalpy?

The set of elements that differ in mutual relationship from those of the other sets is

The process that is not endothermic in nature is

The process that is not endothermic in nature is

In general, the properties that decrease and increase down a group in the periodic table, respectively are

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The ionic radii of O2−,F−,Na+ and Mg2+ are in the order

According to the periodic law of elements, the variation in properties of elements is related to their

Which of the following atoms has the highest first ionisation energy?

Which one of the following order represents the correct sequence of the increasing basic nature of the given oxides?

The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The size of the iso-electronic species Cl−, Ar and Ca2+ is affected by

The set in which compounds have different nature is

The group number, number of valence electrons and valency of an element with atomic number 15, respectively, are

The atomic number of unnilunium is …… .

The correct order of the ionic radii of $O^{2 -}$ , $N^{3 -}$ , $F^{-}$ , $Mg^{2 +}$ , $Na^{+}$ and $Al^{3 +}$ is

The ionic radii of $O^{2 -}, F^{-}, N a^{+}$ and $M g^{2 +}$ are in the order

The size of the iso-electronic species $Cl^{-}$ , $Ar$ and $Ca^{2 +}$ is affected by