[Audio] Good morning/afternoon everyone. Today I'm going to discuss the atomic radius of elements on the periodic table. Let's take a look.. 

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[Audio] The atomic radius changes as one moves from left to right across a period in the periodic table and down a group. Going from left to right, the atomic radius decreases due to the stronger attraction force between electrons which draws them closer together. Conversely, going down a group increases the atomic radius as the energy level increases, pushing the electrons farther away. This relationship between attraction force and energy level is a direct and inverse proportion, respectively.. 

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ATOMIC RADIUS TREND ON THE PERIODIC TABLE, ATOMIC RADIUS GENERALLY DECREASES AS YOU MOVE FROM LEFT TO RIGHT ACROSS A PERIOD ,AND INCREASES AS YOU MOVE DOWN A GROUP

The atomic radius decrease as you move from left to right : ( high attraction force this decrease the  atomic radius because the electrons become more closer to each other and when it’s less attraction force this increase the  atomic radius because the electrons become farther away from each other , this is inversely proportional  ) . And the atomic radius increase as you move from up to down : ( less energy level this decrease the atomic radius and more the energy level this increase the atomic radius  ,  this is directly proportional )

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Periodic trends : Atomic radius 

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Today I'm going to discuss the atomic radius of elements on the periodic table

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The atomic radius changes as one moves from left to right across a period in the periodic table and down a group

Going from left to right, the atomic radius decreases due to the stronger attraction force between electrons which draws them closer together

Conversely, going down a group increases the atomic radius as the energy level increases, pushing the electrons farther away

This relationship between attraction force and energy level is a direct and inverse proportion, respectively.

Periodic trends : Atomic radius

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