Makes good projectile to fire at very thin metal foil to test plum pudding model. Show Rutherford expt. H vs. other atoms. Relationship between electronic structure of atoms and position on Periodic Table. Build some atoms.
Blocks hold atoms with valence electrons in same subshell configuration.
In ions charge determined by balance between protons and electrons. These atoms have low electronegativity. Lie to left on Periodic Table. Have high EN's. Lie to right on Periodic Table.