Which of the following best describes how Mendeleev organized the elements in his periodic table?

By arranging elements into rows and columns based on similar behavior and properties.

Which of the following statements is true regarding ionic radius?

Adding electrons makes an atom bigger.

I can explain how the periodic table is organized and use it to predict properties of elements.

1
As you move down the periodic table, the atomic radius increases because you are adding more electron shells.
2
Ionization energy is the energy required to remove an electron from an atom, and it generally increases as you move up and to the right on the periodic table.
3
Electronegativity, or the ability of an atom to hold electrons tightly, generally increases as you move up and to the right on the periodic table.