Practice test 1. The atom

The first person to ever talk about an atom was ___________

• Democritus

• Rutherford

• Dalton

• Thomson

Who stated that all atoms of the same element are exactly alike?

• Democritus

• Dalton

• Thomson

• Borh

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

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

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

The comparison of the number of atoms in a copper penny with the number of people on Earth is made to illustrate which of the following?

• that atoms are indivisible
• that atoms are extremely small
• that the universe is extremely large
• that there are enough pennies for every person on Earth

In the cathode ray experiment, because the ray is deflected by a magnetic field, then the particles in the ray must be _____________

• charged

• nucleus

• small

• droplets

The __________contains most of the mass of an atom.

• electron cloud

• nucleus

• proton

• neutron

____________is the simplest of all atoms and contains only one proton and one electron.

• Oxygen

• Hydrogen

• Water

• Isotope

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

What does the nucleus of an atom contain?

• Electrons and neutrons

• Protons and neutrons

• Neutrinos and positrons

• DNA and RNA