Unit 3 che v1

INTRODUCTION

Periodic trends are specific patterns in the properties of elements which keep on repeating after regular intervals in the periodic table.

Following are the periodic trends in some of the properties of elements;

ATOMIC RADII

WHAT IS ATOMIC RADIUS?

Atomic radius is half of the distance between the nuclei of the two bonded atoms.

MATHEMATICALLY

Atomic radius = d/2

Where,

D is the distance between the nuclei of two bonded atoms

INTRODUCTION

the long form of periodic table is the present-day periodic table and is based upon the modern periodic law which establishes the atomic number of the elements as the basis for periodicity.

EXPLANATION

• The significance of atomic number in the arrangement of elements in the modern periodic table lies in the fact that as electronic configuration is based upon atomic number, therefore the arrangement of elements in accordance with increasing atomic number displays the periodicity (repetition of properties after regular intervals) in the electronic configuration of the elements leading to periodicity in their properties.

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INTRODUCTION

• The periodic table is a list of elements arranged in the order of their increasing atomic (proton) numbers.

EXPLANATION

• In nineteenth century, chemists devoted much of their efforts in attempts to arrange elements in a systematic manner.
• These efforts resulted in discovery of periodic law.

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