compared to a neon atrom a helium atom has...?

Question

1) smaller radius
2) smaller first ionization energy
3) larger atomic number
4) greater number of electrons

PLEASE SHOW PROOF

Answer 1

There's no proof needed. Just look at a periodic table. Since helium is above neon and they're in the same column, helium will be a smaller atom. So 1) is your answer.

You can rule the others out:
2 is wrong because He's electrons are closer to the nucleus (first shell) so are harder to remove.
3 is wrong because Ne has a larger atomic number
4 is wrong because NE has a larger atomic number and so more electrons.

Answer 2

smaller radius!!
I hope this helps!!