Atomic Theory

The smallest unit of a pure substance that has the properties of that substance

• element
• atom
• neutron
• compound

Atoms are made up of three basic parts, which are -

• Protons, neutrons, electrons
• neutrinos, protons, neutrons
• quarks, protons, electrons
• electrons, neutrons, and quarks

The nucleus is made up of -

• neutrons and electrons
• protons and neutrons
• protons and electrons
• electrons and quarks

Protons have this charge -

• positive
• negative
• neutral
• no charge

Electrons have this charge - 

• positive
• negative
• neutral
• no charge

Neutrons have this charge -

• positive
• negative
• neutral
• They don't exist

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

Place the following scientists in order, from earliest to latest: 
A) Ernest Rutherford
B) J.J. Thomson
C) John Dalton

• B,C,A
• C,A,B
• A,C,B
• C,B,A

An atom's overall charge is ________.

• positive 
• depends
• neutral 
• negative 

J.J. Thomson provided evidence that an atom...

• is the smallest particle of matter
• contains negatively charged particles
• has an overall negative charge
• has an overall positive charge