NEET Chemistry Classification Of Elements Periodicity In Properties Class 11 Questions

Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N and Cl are not the same. C. Ar, K⁺, Cl⁻, Ca²⁺, and S²⁻ are all isoelectronic species. D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si > Al > Mg > Na. E. The atomic radius of Cs is greater than that of Li and Rb. Choose the correct answer from the options given below:

Which among the following electronic configurations belong to main group elements? A. [Ne]₃s¹ B. [Ar]₃d³4s² C. [Kr]₄d¹⁰5s²5p⁵ D. [Ar]₃d¹⁰4s¹ E. [Rn]₅f⁶6d²7s² Choose the correct answer from the option given below: (1) B and E only (2) A and C only (3) D and E only (4) A, C and D only

Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N

Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si

The element expected to form largest ion to achieve the nearest noble gas configuration is:

Identify the INCORRECT statement from the following.

Gadolinium has a low value of third ionisation enthalpy because of ________.

For the second period elements the CORRECT increasing order of first ionization enthalpy is ________.

Which of the following oxides is the most acidic in nature?

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?

The electronic configurations of Eu (atomic no. 63), Gd (atomic no. 64) and Tb (atomic no. 65) are ______, respectively.

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

Which one of the following orders is CORRECT for the bond dissociation enthalpy of halogen molecules?

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

Which of the following orders of ionic radii is CORRECTLY represented?

Be²⁺ is isoelectronic with which of the following ions?

The outer electronic configuration of Gd: (At. No. 64):

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?