Question

Q. Discuss the gradation in following properties of elements in Modem Periodic Table -
(a) Atomic size
(b) Metallic and non-metallic character
(c) Valency​

Answer 1

Answer:

TREND OF VALENCY - DEFINITION

In a period, the number of valence electrons increases as we move from left to right side. However, in a group this periodic trend is constant, that is the number of valence electrons remains the same.

TREND OF METALLIC AND NON-METALLIC PROPERTIES IN MODERN PERIODIC TABLE - EXAMPLE

In modern periodic table metallic character increases down the group and decreases from left to right across the period.

TREND OF ATOMIC SIZE IN PERIODIC TABLE - EXAMPLE

The atomic radius of an element is a measure of the size of its atoms. It represents the mean distance from the nucleus to the outermost boundary of the surrounding cloud of electrons. Atomic radii vary in a predictable manner across the periodic table.

Answer 2

Explanation:

Atomic size :

Down the group - increases

Across the period - decreases

Metallic property :

Down the group - increases

Across the period - decreases

Non metallic property :

Down the group - decreases

Across the period - increases

Valency :

Down the group - Remains same

Across the period - First increase and then decrease..

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