Chem 1, Unit 3 Quiz

What does the atomic number of an element represent?

• The number of neutrons in the atom

• The number of protons in the atom

• The total number of protons and neutrons in the atom

• The number of electrons in the outer shell

According to the atomic theory, why is an atom neutral?

• Because it contains an equal number of protons and neutrons

• Because neutrons balance the charges

• Because it contains an equal number of protons and electrons

• Because electrons do not carry charge

For a neutral atom, the number of protons is equal to the number of:

• Neutrons

• Electrons

• Isotopes

• Ion particles

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The total number of protons and neutrons

• The number of electrons around the nucleus

How is the atomic mass of an atom primarily calculated?

• By adding the number of electrons and protons

• By counting the number of neutrons only

• By summing the number of protons and neutrons

• By using the atomic number alone

What is the significance of the atomic mass being different from the atomic number?

• It indicates the number of electrons in an atom

• It shows the atom is neutral

• It reflects the total weight of protons and neutrons, which are the main contributors to the mass of an atom

• It determines the chemical properties of the element

What is the atomic number of Carbon as shown in the diagram?

• 12

• 6

• 12.01

• C

According to the diagram, what is the rounded atomic mass of Carbon?

• 12.0115

• 6

• 12

• 12.01

What does the atomic number of an element represent?

• The number of neutrons

• The number of protons and electrons

• The total number of protons, neutrons, and electrons

• The atomic mass

What is the atomic number of carbon?

• 12

• 6

• 0

• 1