History of Atoms

Atoms and who helped discover them.

By Bill Goette

Multiple Choice

What did Democritus contribute?

• The name and idea of atoms

• elements make compounds

• named the nucleus and neutrons

• electrons are negative

Multiple Choice

What did John Dalton say?

• John Dalton said that matter is made up of atoms, which are indivisible and unique to each element.
• John Dalton stated that elements are made of molecules.
• John Dalton believed that atoms can be created and destroyed.
• John Dalton claimed that all matter is liquid.

Multiple Choice

What did JJ Thomson discover?

• The electron.
• The neutron.
• The nucleus.
• The proton.

Multiple Choice

What did Ernest Rutherford figure out?

• Rutherford discovered the electron.
• Rutherford invented the periodic table.
• Rutherford figured out that atoms have a nucleus.
• Rutherford proposed the theory of relativity.

Multiple Choice

What did James Chadwick discover?

• The neutron.
• The positron.
• The proton.
• The electron.

Multiple Choice

What did Niels Bohr conclude?

• Electrons have fixed positions in an atom.
• Electrons are randomly distributed around the nucleus.
• Electrons occupy orbits or energy levels around the nucleus.

• Electrons do not exist in defined energy levels.

Multiple Choice

Where are the electrons found according to the Modern Quantum Model?

• Electrons are located in the nucleus.
• Electrons are found in a cloud around the nucleus.

• Electrons are found in fixed paths around the nucleus.
• Electrons are scattered randomly throughout the atom.