Periodic Properties and Their Trends

IMPORTANT

Periodic Properties and Their Trends: Overview

This Topic covers sub-topics such as Ionisation Enthalpy, Electronegativity, Electron Gain Enthalpy, Atomic Radius, Effective Nuclear Charge, Screening Effect, Periodic Properties, Van der Waals Radius and, Diagonal Relationship in Periodic Table

Important Questions on Periodic Properties and Their Trends

HARD
IMPORTANT

In which of the following arrangements, the order is/are not according to the property indicted: 

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IMPORTANT

The first ionisation enthalpies iH1, second ionisation enthalpies iH2 and electron gain enthalpy egH of the elements I, II, III, IV and V are as follows:

Element iH1 kJ/mol iH2 kJ/mol egH kJ/mol
I 520 7300 -60
II 419 3051 -48
III 1681 3374 -328
IV 1008 1846 -295
V 2372 5251 +48

The most reactive metal and the least reactive non-metal of these elements are respectively

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IMPORTANT

How much energy in joules must be needed to convert all the atoms of sodium ions present in 2.3 mg of sodium vapours? Ionisation enthalpy of sodium is 495 kJ/mol.

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IMPORTANT

The amount of energy released when one million of atoms of iodine in vapour state are converted to I- ions is 4.9×10-13 J according to the reaction: Ig + e-  I-g

Express the electron gain enthalpy of iodine in terms of kJmol-1 and eV per atom.

HARD
IMPORTANT

Explain the various factors that affect electron affinity.

MEDIUM
IMPORTANT

Calculate the electronegativity value of fluorine on Mulliken’s Scale, given that -

  • Ionisation potential of F=17.4 eV/atom
  • Electron affinity of F=3.62 eV/atom

EASY
IMPORTANT

How Ionisation energy of an atom is affected by nuclear charge ?

EASY
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Explain the acid strength of oxoacids of chlorine?

EASY
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How the acidic strength of hydrides down the group?

EASY
IMPORTANT

Arrange Be,Mg,Ca,Sr in the ascending order of ionisation enthalpy.

MEDIUM
IMPORTANT

The correct order of 1st ionisation enthalpy among the following elements Be, B, C, N, O is

EASY
IMPORTANT

Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.

EASY
IMPORTANT

Name the element with maximum electron affinity.

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

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

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

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IMPORTANT

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

HARD
IMPORTANT

The sizes of following species increase in the order:

MEDIUM
IMPORTANT

The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic step as shown below: Og+e-1O-g;H0=-142 kJ mol-1
O-g+e-1O2-g;H0=+844 kJ mol-1
This is because