CEM 141 Lecture Notes - Lecture 3: Subatomic Particle, Chlorophyll
Document Summary
Claim: plant"s leaves are green in the summer because. Reasoning: chlorophyll is a natural pigment that absorbs all wavelengths in the visible spectrum except green. The reflected green light is the color our eyes see. Greeks: came up with the earliest atomic theory. Not based on experimental evidence- based on philosophy. Atoms were thought to be in constant motion- based on watching the movement of specks of dust in sunlight- and that there was nothing or a. Void between them ( later called brownian motion) The type of atom that makes it up. An element is made up of all the same atoms, while a compound is made up of 2 or more elements. Atom is the smallest unit of an element. Elements are ordered on the periodic table. 91 or 98 elements are naturally occurring-number is arguable. The first subatomic particle to be discovered was the electron.
