Studied by 2 people
Protons
positive charge, in nucleus, 1 AMU
Neutrons
no charge/neutral charge, in nucleus, 1 AMU
Electrons
negative charge, outside nucleus in electron cloud, approximate mass of 0 AMU
Democritus
theorized about atoms and introduced the idea of a piece of indivisible matter
Dalton
Discovered the scientific idea of the atom in 1803
Thomson
discovered electrons in 1904
Rutherford
Discovered the positively charged nucleus that bounced back alpha particles in an experiment with gold foil in 1911
Bohr
figured out quantized orbitals in 1913
Schrodinger
theorized with math to see where electrons are likely to be in 1926
Chadwick
discovered neutrons in 1932
Mole
Avegadro’s number, a unit for measuring very small things like atoms; 6.02 ×10²³
Scientific Notation
used to make huge or tiny numbers easier to write; one non-zero before decimal point and two places after
Scientific Notation Big Numbers
make smaller by moving decimal point to the left, positive exponent
Scientific Notation Small Numbers
make bigger by moving decimal point to the right, negative exponent
