The periodic table | Chemistry | Khan Academy

Periodic Table of Elements Explained - Metals, Nonmetals, Valence Electrons, Charges

Study nature closely and you begin to notice the same patterns showing up everywhere. The veins in a leaf resemble those in the human hand. Tree branches echo the structure of our lungs. Rivers divide like blood vessels flowing through the body. Neural pathways in the brain look strikingly similar to galaxies in the cosmos. Different scales, same underlying design. It’s almost like creation runs on a shared language of order and connection. Nothing truly stands alone. Every system sustains anoth