Atom Models

Question 1

Dalton Model

Answer 1

1808

Atoms are small solid spheres, different sizes for different elements

Question 2

Thomson Model

Answer 2

1897

Atoms are made up of a positively charged sphere with negative electrons in the sphere

Question 3

Nagaoka Model

Answer 3

1904

Atoms are made up of a positive sphere with negative electrons orbiting like the planets orbit the sun.

Question 4

Rutherford Model

Answer 4

1911

Atoms are mostly empty space with negative electrons orbiting randomly around the positively charged protons

Question 5

Bohr

Answer 5

1913

Atoms are positively charged protons with electrons orbiting the nucleus in distinct energy shells

Question 6

Modern Model

Answer 6

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