Rating the atomic radius

Measuring the size of an atom is not a straightforward answer either. It s like measuring a ball of fur. If you measure it as you find it, and then you squeeze it together, the ball of fur has different sizes. This is the same for atoms, because there are different ways to look at the size of the atom. And each of these ways use different techniques to get results. So depending on the technique, the answers vary. 

Sizes of the atoms according to the atomic radii (first number), the covalent radii (second number), and the Van DerWaals radii (third number). 

Following this trend, each subsequent ionization energy is higher in energy. 

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