Atomic Radii, Ionic Radii and Vanderwall Radii

IMPORTANT

Atomic Radii, Ionic Radii and Vanderwall Radii: Overview

This topic covers concepts, such as Screening Effect, Effective Nuclear Charge, Calculation of Effective Nuclear Charge, Applications of Effective Nuclear Charge, Atomic Radius, Covalent Radius, Metallic Radius, Van der Waals Radius, etc.

Important Questions on Atomic Radii, Ionic Radii and Vanderwall Radii

EASY
IMPORTANT

The ions  O2,F,Na+,Mg2+andAl3+ are isoelectronic. Their ionic radii show:

MEDIUM
IMPORTANT

In which of the following arrangements the order is not according to the property indicated against it ?

EASY
IMPORTANT

Metal ions in the fourth period are expected to show decrease in their ionic radii of the M2+ ions from Ca2+to Zn2+, due to the increase in the nuclear charge, as shown by the dotted line in the Figure given below. When they form octahedral complexes with weak field ligands, the expected regular decrease is not observed, as shown by the solid line in the Figure. The correct statement(s) is/are

Question Image 

EASY
IMPORTANT

Select the incorrect orders about the size of the given species:

EASY
IMPORTANT

Assertion. Na+ and Al3+ are isoelectronic but the magnitude of the ionic radius of Al3+ is less than that of Na+ .

Reason. The magnitude of effective nuclear charge of the outer shell electrons in Al3+ is greater than in Na+ .

EASY
IMPORTANT

The atomic radii of Li, F, Na and Si follow the order:

EASY
IMPORTANT

Identify the correct order of ionic radii of the given species:

MEDIUM
IMPORTANT

Which among the following iso-electronic species has the smallest size?
O2-, F-, Ne, Na+, Mg2+, Al3+, Si4+

MEDIUM
IMPORTANT

The ions S2-, Cl-, K+, Ca2+ are iso-electronic. Their ionic radii show _______

EASY
IMPORTANT

Which of the following has highest value of ionic radius?

MEDIUM
IMPORTANT

The correct order of radius for the following elements is

Ti, Co, Cs, Br, K, O, F

MEDIUM
IMPORTANT

The ionic radii of Na+, F-, O2-, N3- follow the order

EASY
IMPORTANT

The correct order of energy of 2s-orbitals in H, Li, Na and K, is
 

EASY
IMPORTANT

Nuclear charge increases with an increase in ________.

HARD
IMPORTANT

In crystals of which of the following ionic compounds, would you expect the maximum distance between centres of cations and anions.

HARD
IMPORTANT

Which among the following species has the same number of electrons in its outermost as well as penultimate shell ?

HARD
IMPORTANT

The correct arrangement for the ions in the increasing order of their radii is

HARD
IMPORTANT

The correct order of decreasing ionic radii among the following isoelectronic species is

HARD
IMPORTANT

For Na+ , Mg2+ , F- and O2- the correct order of increasing ionic radii is