How many Cl atoms can you ionise in the process Cl → Cl + + e - by the energy liberated for the process Cl + e - → Cl - for one Avogadro's number of atoms? Given, IP = 13 . 0 eV and EA = 3 . 60 eV . Avogadro's number = 6 × 10 23 .

Ionization potential is the energy required to remove an electron from the outermost shell of an atom. Cl ⟶ Cl + + e − , IE = 13 . 0 eV . The electron affinity is the potential energy change of the atom when an electron is added to a neutral gaseous atom to form a negative ion. Cl + e − ⟶ Cl - , EA = 3 . 6 eV . Therefore, the moles of chlorine atoms that can be ionised = electron affinity ionization potential = 3 . 6 eV 13 . 0 eV = 0 . 277 . Thus, the number of atoms = 0 . 277 × 6 . 022 × 10 23 = 1 . 667 × 10 23 atoms.

E M B I B E

Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 77

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What is lanthanide contraction? What are its consequences?

Important Questions on Classification of Elements and Periodicity in Properties

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 78

The first

IP

of lithium is

5.41 eV

and electron affinity of

Cl

is

- 3.61 eV

. Calculate

∆ H

in

kJ {mol}^{- 1}

for the reaction:

Li (g) + Cl (g) \to Li {(g)}^{+} + Cl {(g)}^{-}

.

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 79

How many

Cl

atoms can you ionise in the process

Cl \to {Cl}^{+} + e^{-}

by the energy liberated for the process

Cl + e^{-} \to {Cl}^{-}

for one Avogadro's number of atoms? Given,

IP = 13.0 eV

and

EA = 3.60 eV

. Avogadro's number

= 6 \times 10^{23}

.

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 80

The electron affinity of chlorine is

3.7 eV

. How much energy in

kcal

is released when

2 g

of chlorine atoms is completely converted to

{Cl}^{-}

ions in the gaseous state?

(1 eV = 23.06 kcal)

.

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 81

Discuss the classification of elements by Mendeleev.

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 82

From a study of properties of neighbouring elements, the properties of an unknown element can be predicted-Justify with an example.

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 83

Discuss the construction of long form periodic table.

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 84

Discuss the relation between the number of electrons filled into sub energy levels of an orbit and the maximum number of elements present in a period.

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Intermediate First Year Chemistry>Chapter 2 - Classification of Elements and Periodicity in Properties>QUESTIONS>Q 85

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