Understanding Atomic Structure

What is the atomic mass of a carbon atom in unified atomic mass units?

• 14 u

• 6 u

• 1 u

• 12 u

Which particles are found in the nucleus of an atom?

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Electrons only

If an atom were the size of a football stadium, what would be the size of its nucleus?

• A grain of sand

• A basketball

• A pea

• A football

What primarily contributes to the size of an atom?

• Protons

• Neutrons

• Electrons

• Nucleus

What type of charge do protons carry?

• Positive

• No charge

• Negative

• Neutral

What force keeps electrons from flying off into space?

• Magnetic force

• Gravitational force

• Nuclear force

• Electric force

Who discovered how to count protons in the nucleus?

• Ernest Rutherford

• Henry Moseley

• Niels Bohr

• Albert Einstein

What is the atomic number of sodium?

• 10

• 11

• 12

• 13

What does the atomic number of an element represent?

• Number of electrons

• Number of neutrons

• Number of protons

• Number of atoms

Why are atomic numbers consecutive whole numbers?

• Neutrons are whole numbers

• Protons are whole numbers

• Protons can be fractions

• Electrons are whole numbers