Test 1! Flashcards
What contributions did Thales make?
water
What contributions did Anaximander make?
earth
What contributions did Anaximenes make?
air
What contributions did Heraclitus make?
fire
What contributions did Empedocles make?
material pluralism
What contributions did Leucippus and Democritus make?
introduced and spread atomism
What contributions did Antoine Lavoisier make?
law of conservation of matter
What contributions did Joseph Louis Proust make?
law of definite proportions
John Dalton
law of multiple proportions
JJ Thomson
discovered electron
- atom = circle with electrons and protons floating around
Ernest Rutherford
discovered proton
positive charge = concentrated in nucleus with electrons floating around
Neils Bohr
electrons travel in orbit
Louis De Brogile
matter has wave characteristics
Erwin Schrodinger
proposed new model based on Brogile’s findings
John Dalton atom, Leucippus/ Democritus
sphere
JJ Thomson atom
sphere with subatomic particles floating around
Neils Bohr atom
orbits
Erwin Schrodinger
nucleus with electron cloud
nucleus
center of atom
holds protons and neutrons
positive charge
electron cloud
empty space with electrons floating around
negatively charged
proton properties
positive charge
relative mass: 1837
location: nucleus
neutron properties
no charge
relative mass: 1839
location: nucleus
electron properties
negative charge
relative mass: 1
location: electron cloud
atomic number
number of protons and therefore also electrons
mass number
number of nucleons (protons and neutrons)
nucleon
protons and atoms in nucleus
isotope
same number of protons and electrons but different number of neutrons
isobar
same atomic mass but different atomic number
isotopic mass
mass relative to carbon-12
Percent abundance
percent of atoms in a natural sample that are the isotope of a certain element
relative atomic mass
mass taking into account proportion of each isotope
