Question

How does the atomie radius change as you go from left to right in
a period?
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Answer 1

Answer:

Atomic radii decreases when we move from left to right across periodic table that is when we move left to right in a period because the number of valence electrons increases and the attraction between electron and the nucleous increases hence the shell shrinks towards the nucleous.

Also, due to effective Nuclear Charge, the atomic size decreases

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Answer 2

Answer:

the atomic radius changes as you go from left to right within a period.this is caused by the increase of number of proton and electron across a period