Chem Hw help?

Question

Whats the period number of a element?

and

If the nucleus of an atom were the size of a medium sized orange (about 6cm diameter), what would be the diameter of the atom?

Answer 1

(Second Question Clue)

the diameter of a nucleus is about 1/10000th the diameter of the atom.

You do the math!

:)

Answer 2

Period number refers to the highest occupied first principle quantum number. (The highest energy shell)

I'm not sure about the second question, but my assumption is the Earth, since an atom's size is so large compared to the nucleus's size.