What are molecules made of?

• Atoms

• Cells

• Ions

• Compounds

What does the nucleus of an atom contain?

• Electrons and protons

• Protons and neutrons

• Neutrons and electrons

• Protons and electrons

What moves around the nucleus of an atom?

• Protons

• Neutrons

• Electrons

• Molecules

What analogy is used to describe the movement of electrons around the nucleus?

• The moon and the Earth

• The sun and orbiting planets

• A spinning top

• A rotating wheel

Which of the following statements is true about atoms in different materials?

• All materials have the same number of electrons.

• Different materials have different numbers of electrons.

• Electrons do not orbit in paths.

• Atoms in gases are more tightly bound than in solids.

In a steady state, what is the relationship between protons and neutrons in an atom?

• Protons are greater than neutrons.

• Protons are less than neutrons.

• Protons equal neutrons.

• Protons and neutrons do not relate.

What are the paths called in which electrons orbit?

• Rings

• Circles

• Shells

• Loops

How are atoms in solids and liquids compared to those in gases?

• Atoms in solids and liquids are loosely bound compared to gases.

• Atoms in solids and liquids are tightly bound compared to gases.

• Atoms in solids and liquids are not bound at all.

• Atoms in solids and liquids are bound the same as in gases.

What is the flow of electrons called?

• Voltage

• Resistance

• Current

• Capacitance

What happens to electrons if there is no pressure?

• They move in a straight line

• They become positively charged

• They are random

• They stop moving