Question

tabulate the trends in the modern periodic table
1. valency
2. Atomic size
3. Metallic and non metallic character.
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Answer it​

Answer 1

Answer:

metallic and non metallic character

Explanation:

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Answer 2

Answer:

Explanation:

METALLIC AND NON-METALLIC PROPERTIES - DEFINITION

The tendency of an element to lose electrons and form positive ions (cations) is called electropositive or metallic character. The tendency of an element to accept electrons to form an anion is called its non-metallic or electronegative character. In each period, metallic character of elements decreases as we move to the right. Elements to the left of the periodic table have a pronounced metallic character while those to the right have a non-metallic character. Conversely, non-metallic character increases from left to right.

As we move down the group the number of shells increases. This causes the effective nuclear charge to decrease due to the outer shells being further away: in effect the atomic size increases. The electrons of the outermost shell experience less nuclear attraction and so can lose electrons easily thus showing increased metallic character.ATOMIC SIZE OR ATOMIC RADIUS - DEFINITION

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.

FACTORS WHICH AFFECT ATOMIC SIZE - EXAMPLE

Factors affecting atomic size are:  

a) Screening effect- caused by mutual repulsion between electrons in the inner shell with those in the outer shell.

b.) Nuclear charge- more the number of protons in the nucleus.more will be the  pull on electrons closer to the nucleus which causes the atomic size to decrease

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