How do you arrange the following atoms in order of increasing atomic radius: Na, Be ,Mg?

1 Answer
anor277
Jan 1, 2017

Atomic radius decreases across a Period.........

Explanation:

Atomic radius decreases across a Period from left to right as we face the Table, and INCREASES down a Group. You can use the Periodic Table for immediate ordering of atomic radii on this simple basis/

Second Period beryllium is definitely smaller than third Period magnesium, but Group 2 metal magnesium is definitely smaller than Group I metal sodium.

So in order of increasing atomic radius: #Be# #<# #Mg# #<# #Na.#

See this site for actual numbers. As a chemist, as a physical scientist, you should always have a handle on the relevant data.

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