I need help with Chemistry please! I need to explain why the relationship exists between atomic numbers and ionic radii and then first ionization.

Question

I need help with Chemistry please!  I need to explain why the relationship exists between atomic numbers and ionic radii and then first ionization.

mortonsalt · Answer

Are you familiar with the concept of effective nuclear charge?

mortonsalt · Answer

Let's start by thinking about it one by one, starting with: What are atomic numbers? 
The atomic number is the number of protons.

What do we know about the number of protons that could be relevant to analysing the radii and the ionization of an atom?