Rank these in order of increasing atomic radii: Si, Cl, Na, F?

Answer 1

Atomic radius increases going from right to left across the table within a period, and increases going from top to bottom within a group. Therefor, the order of increasing radii would be...

F < Cl < Si < Na

Answer 2

Hi Lilly,

Periodic table trends can be hard to keep straight - atomic radii will decrease as you go from left to right on a row in the periodic table and increase as you go top to bottom in a group (column) in the table.

Using that understanding of you should be able to use the periodic table and rank these in order.