Thousands of years ago, it was thought matter was made of four elements. Which of the following is incorrect?

• helium

• water

• earth

• air

Whose ideas had more credibility because he was very influential at the time?

• Newton

• Aristotle

• Democritus

• Mendel

Who was the first to challenge the idea of matter being made of four elements?

• Rutherford

• Aristotle

• Democritus

• Bohr

Who was the first to talk about matter being made of small particles called atoms?

• Aristotle

• Rutherford

• Bohr

• Democritus

Who proposed this atomic model?

• Bohr

• Aristotle

• Thompson

• Rutherford

What enabled scientists to observe atoms for the first time?

• compound light microscope

• simple light microscope

• scanning tunneling microscope

• transmission electron microscope

Which scientist discovered the electron?

• Bohr

• Thompson

• Rutherford

• Aristotle

Whose model can resemble a chocolate chip cookie?

• Thompson's

• Rutherford's

• Bohr's

• Aristotle's

What did Rutherford's experiment contribute?

• The discovery of a dense nucleus

• The discovery of electrons

• The discovery of an electron cloud

• The discovery of quarks

Where is the electron most likely to be located?

• in the nucleus

• attached to neutrons

• attached to protons

• in the electron cloud