The compound having higher melting point between L i F and C s I has to be determined and a brief explanation for this has to be given. Concept Introduction: Coulomb’s law: It states that the magnitude of the electrostatic force between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them. F = k Q 1 Q 2 r 2 Where, k = Electrostatic constant. Periodic trend of size: Atomic radius decreases from left to right within a period. This is due to the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius and smaller size. Atomic radius increases from top to bottom within a group. This is due to electron shielding.

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Chapter 9, Problem 39QRT

Interpretation Introduction

Interpretation:

The compound having higher melting point between LiF and CsI has to be determined and a brief explanation for this has to be given.

Concept Introduction:

Coulomb’s law:

It states that the magnitude of the electrostatic force between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.

F=k Q1Q2r2

Where, k= Electrostatic constant.

Periodic trend of size:

Atomic radius decreases from left to right within a period. This is due to the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius and smaller size. Atomic radius increases from top to bottom within a group. This is due to electron shielding.

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