Q. Discuss the gradation in following properties of elements in Modern Periodic Table -
(a) Atomic size
(b) Metallic and non-metallic character
(c) Valency
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2
Answer:
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.
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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.
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