Question

Define atomic size
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Answer 1

The between nucleus of an atom and outer most valence cell of an atom called atomic radius .

Atomic Radius of an atom which decide the size of an atom .

• Trends in periodic table

atomic size decreases from left to right in a group.

atomic size increases from top to bottom in a group .

Atomic size depend's on

1. Nuclear force .
2. Screening effect .
3. Number of cell .
4. Number of electron in outer most cell .
5. ionisation enthalpy .

etc

Answer 2

Answer:

It is the distance between center of nucleus and the outermost shell of an isolated atom.

• Atomic Radii decreases from left to right along a period due to increase in nuclear charge..
• Atomic Radius Increases down the group due to addition of extra shell as we go down the group.