Atom Models Flashcards
Dalton Model
1808
Atoms are small solid spheres, different sizes for different elements
Thomson Model
1897
Atoms are made up of a positively charged sphere with negative electrons in the sphere
Nagaoka Model
1904
Atoms are made up of a positive sphere with negative electrons orbiting like the planets orbit the sun.
Rutherford Model
1911
Atoms are mostly empty space with negative electrons orbiting randomly around the positively charged protons
Bohr
1913
Atoms are positively charged protons with electrons orbiting the nucleus in distinct energy shells
Modern Model
1920s to present
Atoms have positive protons and neutral neutrons in the positively charged nucleus with negative electrons orbiting the nucleus in distinct energy clouds