Nice - but don't you mean Atomic Number, not Atomic Mass? The atomic numbers (i.e. the count of protons in the nucleus) are the nice non-overlapping integers 1-118, whereas the masses are all over the shop, and has overlap with isotopes of other elements.

Yep, you're right.

Cute and memorable (for me anyway) without overly personifying them. Perfect.

That's bloody adorable.

awesome. Might have to steal that one.