Bohr’s Atom electrons in orbits nucleus What is an atom? Atom: the smallest unit of matter that retains the identity of the substance.
Atoms and the Periodic Table The Atom Ch. 4. Democritus (400 BC) Greek philosopher. All things are composed of tiny, indivisible particles: called: Atomos.
BELL-RINGER QUESTION 1. Look at the periodic table of elements…. How are the elements in the periodic table like the alphabet of letters?
