Chapter 4 Flashcards
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
Protons
Atomic mass unitA unit of mass that describes the mass of an atom or molecules
Atomic mass unit
A subatomic particle that has no charge and that is found in the nucleus of an atom.
Neutron
The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
Atomic Number
An atom that has the same number of protons(or the same atomic number) as the other atoms of the same element do but that has a different number of neutrons ( and thus a different atomic mass)
Isotope
The sum of the numbers of protons and neutrons in the nucleus of an atom
Mass Number
The mass of an atom expressed in atomic units
Atomic Mass
NucleusIn physical science, an atom’s central region, which is made up of protons and Neutrons
Nucleus
A region around the nucleus of an atom where electrons are likely to be found
Electron Cloud
A subatomic particle that has a negative charge
Electrons
The smallest unit of an element that maintains he properties of that element
Atom
Thought of the idea that you can break a substance, than reach a particle that could not be broken
Democritis
Took Democritis’ idea and experimented with different substances
Dalton
Discovered that there are smaller particles inside an atom: made a Plum pudding model
Thomsom
Made the “Shooting gallery” experiment. Experimented with gold foil and light to see how the particles moved
Rutherford
