Grade 8 The Atom Summer School

Grade 8 The Atom Summer School

Multiple Choice

The ____ is a weighted average that reflects the abundance of different isotopes.

• ions

• average atomic mass

• mass number

• elements

Multiple Choice

Two neutral atoms that have the same atomic number and different mass numbers are

• ions

• isotopes

• alpha particles

• different elements

Multiple Choice

What is #3

• proton

• neutron

• electron

• nucleus

Multiple Choice

What is #2

• proton

• neutron

• electron

• nucleus

Multiple Choice

What is #1

• proton

• neutron

• electron

• nucleus

Multiple Choice

What is the location of a electron?

• nucleus

• electron cloud

Multiple Choice

Atoms of an element with different number of electrons

• isotope

• ion

• radioactive

Multiple Choice

Atoms of an element with different number of neutrons

• isotope

• ion

• radioactive

Multiple Choice

The atomic number equals _________________

• mass of the atom

• number of protons

• number of neutrons

Multiple Choice

What is the mass of a proton

• 1

• 0

Multiple Choice

What particle has a (+) positive charge?

• proton

• neutron

• electron

Multiple Choice

What particle has a (-) negative charge?

• proton

• neutron

• electron

Multiple Choice

What is the smallest particle

• electron

• neutron

• proton

Multiple Choice

Why were Rutherford's students surprised by the results of the gold foil experiment?

• they didn't expect the alpha particles to bounce back from the foil

• they didn't expect the alpha particles to continue in a straight path

• they expected only a few alpha particles to bound back from the foil

• they expected the alpha particles to be deflected by electrons

Multiple Choice

J.J. Thomson's experimental setup can be seen in the image. What is happening to the cathode rays?

• they are attracted to the negative plate

• they are attracted to the positive plate

• they are stopped by the paltes

• they are unattracted to either plate

Multiple Choice

An ion that has a negative charge is formed when an atom

• loses neutrons

• loses electrons

• gains neutrons

• gains electrons

Multiple Choice

Two atoms of different elements will definitely have different numbers of

• nuclei

• protons

• neutrons

• electrons

Multiple Choice

The atomic theories of Dalton and Democritus included the idea that atoms

• can be changed by radioactive decay

• cannot be divided, created, or destoryed

• are made up of fire, water, air, and earth

• are made up of protons, neutrons, and electrons

Multiple Choice

Which particles in atoms have a negative electric charge?

• electrons

• protons

• neutrons

• nuclei

Multiple Choice

In an atom, the number of protons equals the number of

• nuclei

• electrons

• neutrons

• isotopes

Multiple Choice

Which of the following scientists inferred that an atom's positive charge must be clustered in the nucleus?

• Niels Bohr

• John Dalton

• Ernest Rutherford

• J.J. Thomson