Activity
Educaplus (Jesús Peñas Cano)

Educaplus: Particulas De Los Atomos E Iones [In Spanish]

For Students 9th - 10th
Use this interactive activity to learn how to interpret the symbols of different elements. You can check your work at the end.
Graphic
Davidson College

Davidson College: Plot of First Ionization Energy and Atomic Number

For Students 9th - 10th
Here you will find a group of images and graphs which plot covalent radii, first ionization energy, and electron affinity vs. atomic number.