Dear friends, Please read our latest blog post for an important announcement about the website. ❤, The Socratic Team

What is the trend in atomic radius from left to right on the periodic table?

1 Answer
Write your answer here...
Start with a one sentence answer
Then teach the underlying concepts
Don't copy without citing sources


Write a one sentence answer...



Explain in detail...


I want someone to double check my answer

Describe your changes (optional) 200

Dec 23, 2015


Atomic size decreases from left to right in the Periodic Table.


As you move from left to right, the nucleus gains protons.

This increases the positive charge of the nucleus and its attractive force on the electrons.

At the same time, electrons are added to the atoms as you move from left to right across a period.

These electrons reside in the same energy shell and do not offer complete shielding.

The effect of the increasing proton number is greater than that of the increasing electron number.

As a result, the valence electrons are held closer to the nucleus, and the atomic radius decreases.

The chart below shows the relative sizes of atoms.

Relative Size

The following video shows how the atomic radius of elements changes as you move across the Periodic Table.

Was this helpful? Let the contributor know!
Impact of this question
4118 views around the world
You can reuse this answer
Creative Commons License