Question

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

Answer 1

hey your ans is here
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when we move across the period ( left to right)
the nuclear charge increases leading to decrease in not only the atomic size but also the radius as such the valence electrons are pulled inwards
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hope it helps!

Answer 2

Before understanding this concept we have to first understand that like charges repel and unlike charges attract . Protons are positively charged and electrons are negatively charged and they both attract each other . More the protons and elections more the attraction it will be.So,let's get started so as we know that the atomic radius is the just the radius between the nucleus and the outermost shell.In the right let's take sodium has three shells and 11 electrons and protons and let's take the right of it which is magnesium which also has three a shells but 12 electrons and 12 protons .So,we can say that the force in magnesium is more then sodium because of more protons and electrons . That is why , In magnesium the protons attract the electrons towards them and the force applied is more due to which they come slightly closer to each other reducing the atomic radius . So,the radius if magnesium is smaller than the radius of sodium due to more electrons.And the atomic radius is going smaller from left to right only because of more force in same amount of shells.