History of the Atom and Basic Atomic Structure

Label the parts of an atom.

b

c

d

e

a

Neutron

Proton

Electron Orbit

Electron

Nucleus

Tags

NGSS.MS-PS1-1

Who was the first contributor to the atomic theory that described the atom as "indivisible"?

• John Dalton

• Ernest Rutherford

• JJ Thompson

• Democritus

• Neils Bohr

What are two facts about Democritus's?

• Greek philosopher

• Created the atomic theory

• Used the cathode ray tube in his discovery

• Believed that the universe was made of tiny "uncuttable" particles

• Discovered that the atom is mostly empty space

Which model of the atom proposed that atoms were positive spheres with negative electrons in them?

• Heliocentric Model

• Solid Sphere Model

• Plum Pudding Model

• Planetary Model

Which scientist saw the atom as a solid sphere?

• Dalton

• Thomson

• Rutherford

• Bohr

Who came up with this model of an atom?

• J.J. Thompson

• Ernest Rutherford

• Neils Bohr

• James Chadwick

Proposed electrons move around the nucleus in shells

• James Chadwick

• J.J. Thomson

• Niels Bohr

• Ernest Rutherford

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

• Atoms

• Parts

• Molecules

• Hydrogen

Democritus believed that the smallest particles, were atomos, the Greek word for 

• small

• uncut or indivisible

• basic

Each atomic model was unrelated and unimportant to the next model in the history of the atomic theory.

• True

• False