i need hw help on atomic and ionic radii (chemistry)?

Question

if anyone can help me out with some useful informaton email me at [e-mail]
- what happens to atomic radii within a period as the atomic number increases?
-cite any exceptions to the question above

-What accoutns for the trend in atomic radii within a group?
-Ddo the larger numbers also mean larger atomic radii? same with smaller numbers
ex: is -1 bigger than 5+ or is it visa versa?

Answer 1

Atomic radius generally goes down as you go from left to right along any period of the Periodic Table.
This is due to the fact that more protons are being added to the nucleus, but the electrons are being added to the outer level in each case, and there is little or no extra shielding, so the forces of attraction get greater.
The only exception is the Transition Metals, where radius stays more or less constant.