History and Basics of the Atom

Who was the first person to come up with the Atomic Theory which included four parts.

• John Dalton

• Democritus

• Ernest Rutherford

• Niels Bohr

Who discovered the electron?

• Niels Bohr
• Democritus
• Joseph Thomson
• John Dalton

The central region of an atom where neutrons and protons are located is the __________________.

• nucleus 
• electron cloud
• core 
• center 

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

Worked with Rutherford to discover particles with no charge -- called neutrons.

• James Chadwick

• Niels Bohr

• Democritus

• Thomson

Used the word "atomos" to decsribe the uncuttable (indivisible) atom.

• Democritus

• Thomson

• Bohr

• Dalton

Proposed that electrons move around the nucleus in specific layers, or shells.

• Bohr

• Rutherford

• Chadwick

• Thomson

This picture best represents ___________________ atomic model.

• Thomson's

• Dalton's

• Bohr's

• Chadwick's

Where can electrons be found?

• On orbitals

• In the nucleus

• In the middle

• On orbits

Where can protons and neutrons be found in the atom?

• On orbitals

• On the outside ring

• Inside the nucleus

• Next to the nucleus