In order , increasing atomic size :Na,F,P,Ca ?

Answer 1

This link will help you understand the size vs where it is in the periodic table.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjzz7a98sjpAhVCM6wKHai-DY0QwqsBMCR6BAgMEAw&url=https%3A%2F%2Fwww.khanacademy.org%2Fscience%2Fchemistry%2Fperiodic-table%2Fperiodic-table-trends-bonding%2Fv%2Fatomic-radius-trend&usg=AOvVaw0PazJWglO2noQBLfKFSmHn

When you finish you can check your work by looking up the radius or diameter of each element at this url.

https://www.webelements.com/