Are atoms the same size?

Heyyy, just wanted some clarification with this chemistry question. I think they arent the same size since atoms belonging to different elements have different sizes whereas atoms of the same element do have the same size. But i think im wrong lol.

You're right, they aren't all the same size! You can generally assume that the more electrons an atom has, the larger it is going to be.

You're right, they aren't all the same size! You can generally assume that the more electrons an atom has, the larger it is going to be.

No they are not. In fact, as you move accross a period, the size generally decreases, increasing down groups. So flourine is actually smaller than Lithium etc. Pretty crazy and interesting if you ask me...

You're right, they aren't all the same size! You can generally assume that the more electrons an atom has, the larger it is going to be.

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Thanks for the tips, but OP is studying at GCSE level so I didn't want to throw in any unnecessary confusion! When I said generally, I was referring to the fact that the overall trend is an increase, ignoring the small deviations from this when filling different types of orbital etc.

No, you are still wrong.

There are two trends:

If you add more e-, without starting to fill a new shell, the radius decreases.

If you add more e-, which leads to a new shell being filled, the radius increases.

(As TutorsChemistry said IOW)

It's generally an increasing trend - this is what I meant in my original post, so I'm sorry if that wasn't communicated clearly. This wasn't even part of OP's question, I just threw it in there for some extra knowledge, idk what all the fuss is about.