Chapter 11 Test Review

Why did we study JJ Thompson, Ernest Rutherford, Democritus, Dalton, and Heisenberg?

• They were rich and they paid Miss Leon $1,000 to do so.

• They each conducted experiments in which particles collided

• They all helped develop the atomic theory we know today

• They each identified new isotopes of atoms

How do you find an atom's Mass Number?

• Add the atom's electrons and neutrons

• Add the atom's protons and electrons

• Add the atom's neutrons and protons

• Add the atom's atomic number and electrons

What did JJ Thomson discover?

• The electron

• The proton

• The neutron

• The freeze ray

Which has the most mass?

• The proton

• The electron

• The neutron

• None of these

Which has the least mass?

• The proton

• The electron

• The neutron

• None of these

What is an element's "name-tag"?

• It's atomic number

• its atomic mass

• its mass number

• The number of neutrons it has

Isotopes of the same element have the SAME number of

• Protons

• Neutrons

• Electrons

• None of these

How did Democritus think of atoms?

• As small squishy particles

• As small, hard particles

• As small positive indivisible particles

• large, soft particles

What is an atom?

• the smallest particle in the world

• the smallest particle into which an element can be divided

• the smallest particle into which an element can be divided and still be the SAME substance

• The densest particle in the worls

Which particle has a POSITIVE charge?

• Proton

• Neutron

• Electron

• none of these