Chapter 4 Flashcards
smallest particle of matter
atom
His results suggested that elements combine in certain proportions because they are made of single atoms
Dalton
Discovered the plum pudding model
Thompson
Subatomic particle with a negative charge
Electron
Made an experiment called “The Shooting gallery”
Rutherford
An atom’s central region
Nucleus
A region where most electrons are formed
Electron Cloud
Subatomic Particle that is positively charged
Proton
A unit of mass that describes the mass of an atom or molecule
Atomic Mass Unit
Subatomic Particle with no charge
Neutron
Number of protons in nucleus
Atomic Number
An atom with the same number of protons but different number of neutrons throughout an element
Isotopes
Sum of protons and neutrons
Mass Number
The mass of an atom expressed in mass units
Atomic Mass
