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The incorrect decreasing order of atomic radii is:

Which of the following statements are NOT true about the periodic table?
(A) The properties of elements are function of atomic weights.
(B) The properties of elements are function of atomic numbers.
(C) Elements having similar outer electronic configurations are arranged in same period.
(D) An element’s location reflects the quantum numbers of the last filled orbital.
(E) The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled.
Choose the correct answer from the options given below:

The elements of Group $ 13 $ with highest and lowest first ionisation enthalpies are respectively:

Given below are two statements:
Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number.
Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers.
In the light of the above statements, choose the correct answer from the options given below:

Match List-I with List-II.

Choose the correct answer from the options given below:

The incorrect relationship in the following pairs in relation to ionization enthalpies is:

The property/ properties that show irregularity in first four elements of group-$ 17 $ is/are:
(A) Covalent radius
(B) Electron affinity
(C) Ionic radius
(D) First ionization energy
Choose the correct answer from the options given below:

Given below are two statements:
Statement (I): The first ionisation enthalpy of group $ 14 $ elements is higher than the corresponding elements of group $ 13 $.
Statement (II): Melting points and boiling points of group $ 13 $ elements are in general much higher than those of corresponding elements of group $ 14 $.
In the light of the above statements, choose the most appropriate answer from the options given below:

Choose the incorrect trend in the atomic radii ($ r $) of the elements.

10.

The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is:

11.

Electronic configuration of four elements $ A $, $ B $, $ C $ and $ D $ are given below:
(A) $ 1s^2\,2s^2\,2p^3 $ (B) $ 1s^2\,2s^2\,2p^4 $ (C) $ 1s^2\,2s^2\,2p^5 $ (D) $ 1s^2\,2s^2\,2p^2 $
Which of the following is the correct order of increasing electronegativity (Pauling's scale) ?

12.

Which of the following electronegativity order is incorrect?

13.

An element ‘E’ has the ionisation enthalpy value of $ 374 \, \text{kJ mol}^{-1} $. ‘E’ reacts with elements A, B, C and D with electron gain enthalpy values of $ -328 $, $ -349 $, $ -325 $ and $ -295 \, \text{kJ mol}^{-1} $, respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is:

14.

Which of the following statements are correct?
(A) The process of adding an electron to a neutral gaseous atom is always exothermic
(B) The process of removing an electron from an isolated gaseous atom is always endothermic
(C) The $ 1^{\text{st}} $ ionization energy of boron is less than that of beryllium
(D) The electronegativity of C is $ 2.5 $ in $ \mathrm{CH_4} $ and $ \mathrm{CCl_4} $
(E) $ \mathrm{Li} $ is the most electropositive among elements of group I
Choose the correct answer from the options given below:

15.

Given below are two statements:

Statement (I): The radii of isoelectronic species increase in the order:
$\text{Mg}^{2+} < \text{Na}^{+} < \text{F}^{-} < \text{O}^{2-}$

Statement (II):The magnitude of electron gain enthalpy of halogen decreases in the order:
$\text{Cl} > \text{F} > \text{Br} > \text{I}$

In the light of the above statement, choose the most appropriate answer from the options given below:

16.

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

17.

Given below are two statements :
Statement (I) : An element in the extreme left of the periodic table forms acidic oxides.
Statement (II) : Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table,
In the light of the above statements, choose the correct answer from the options given below :

18.

Match the LIST -I with LIST -II.

LIST-I (Family)	LIST-II (Symbol of Element)
(A) Pnictogen (group $ 15 $)	I. Ts
(B) Chalcogen	II. Og
(C) Halogen	III. Lv
(D) Noble gas	IV. Mc

Choose the correct answer from the options given below:

19.

The atomic number of the element from the following with lowest $ 1^{\text{st}} $ ionisation enthalpy is:

20.

The successive $ 5 $ ionisation energies of an element are $ 800 $, $ 2427 $, $ 3658 $, $ 25024 $ and $ 32824 \, \mathrm{kJ\, /mol} $, respectively. By using the above values predict the group in which the above element is present:

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JEE Main 2025 22nd Jan Morning Shift

Which of the following electronegativity order is incorrect?

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