Inv6.Exp1 Text B (pg. 246-248)

What did Ernest Rutherford discover about the atom?

• Electrons are the primary contributors to an atom's mass.

• Protons and electrons are distributed evenly in an atom.

• The nucleus contains only neutrons.

• Most of an atom's mass and positive charge are in the nucleus.

What are the major subatomic particles found in the nucleus?

• Protons and neutrons

• Neutrons and electrons

• Protons, neutrons, and electrons

• Electrons and protons

How did Niels Bohr modify Rutherford's model of the atom?

• By proposing that electrons and protons are mixed together

• By stating that electrons do not orbit the nucleus

• By suggesting electrons orbit the nucleus at fixed distances

• By introducing the concept of orbitals

What does the periodic table reveal about elements?

• Random placement of elements

• All elements have the same properties

• Similar properties of elements in different rows

• Trends and grouping of elements with similar properties

What happens to the atomic radius when more protons are added to the nucleus?

• It fluctuates unpredictably

• It remains constant

• It increases

• It decreases

What is electronegativity?

• The distance between electrons

• The ability to repel electrons

• The weight of an atom

• The ability to attract electrons in a chemical bond

What primarily contributes to an atom's mass?

• Electron clouds

• Orbitals

• Protons and neutrons

• Electrons

How does the atomic radius change as you move down the periodic table?

• It becomes zero

• It decreases

• It remains the same

• It increases

What effect does adding electrons have on the atomic radius?

• Increases the radius

• Decreases the radius

• Makes the atom disappear

• No change

What is the modern view of electrons as described in the passage?

• Electrons are solid particles.

• Electrons are a wave of probable positions called orbitals.

• Electrons are stationary in fixed orbits.

• Electrons are made up of protons and neutrons.