The size of the iso-electronic species $\mathrm{C}{\mathrm{l}}^{-}$ , Ar and $\mathrm{C}{\mathrm{a}}^{2+}$ is affected by:

Important Questions on Classification of Elements and Periodicity in Properties

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 7th January 2020 Shift 2>Q 19

Within each pair of elements $\mathrm{F}$ and $\mathrm{C}\mathrm{l}$ , $\mathrm{S}$ and $\mathrm{S}\mathrm{e}$ , and $\text{Li}$and $\mathrm{Na}$ , respectively, the elements that release more energy upon an electron gain are

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 7th April 2013>Q 20

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na ⁺ will be :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 7th April 2013>Q 21

Which of the following represents the correct order of increasing first ionization enthalpy for $\mathrm{Ca}, \mathrm{Ba}, \mathrm{S}, \mathrm{Se} \text{and} \mathrm{Ar}$?

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 6 September 2020 Shift 2>Q 22

The atomic number of Unnilumium is ______.

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 6 September 2020 Shift 1>Q 23

The set that contains atomic numbers of only transition elements, is :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 5 September 2020 Shift 2>Q 24

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

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 4th April 2015>Q 25

The ionic radii $\left(\text{in}\mathrm{ Å}\right)$ of ${\mathrm{N}}^{3-},\mathrm{ }{\mathrm{O}}^{2-}\mathrm{ }$ and $\mathrm{ }{\mathrm{F}}^{-}\mathrm{ }$ are respectively:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 12 - Classification of Elements and Periodicity in Properties>JEE Main - 4 September 2020 Shift 2>Q 26

The process that is NOT endothermic in nature is :