Atomic Theory Flashcards

Atom

Smallest particle of an element that retains its identity

Dalton’s atomic theory part 1

All matter is made of atoms

Dalton’s atomic theory part 2

Atoms of an element are identical

Daltons atomic theory part 3

Atoms of different elements combine in constant ratios to form compounds

Daltons atomic theory part 4

Atoms can be rearragned in reactions

First disproved point

Atoms are indivisible

Second disproved point

Atoms are identiical

New point 1

Atoms can be broken down into protons neutrons and electrons

New point 2

Atoms of the same element may not be identical (isotopes)

Electrons

subatomic particle Thomson’s cathode ray tube discovered

J.J. Thomson

Discovered the Electron

How did J.j. thomson discover the electron

Through cathode ray tube experiments

Ernest Rutherford

Discovered nucleus 

How did rutherford discover the nucleus

with gold foil experiment

Niels Bohr

“the mass of an atom is made up mostly by the nucleus”

Isotope

Atoms of the same element with different masses

Proton charge

Positive

Proton mass

1 amu

Proton Location

nucleus

neutron charge

neutral

neutron mass

1 amu

neutron location

nucleus

electron charge

negative

electron mass

0 amu

electron location

electron cloud