The structure of an atom

What is the relationship between atomic number and element identity?

• Atomic number defines the element
• Atomic number is irrelevant to element identity
• Elements with different atomic numbers are the same
• Atomic number determines the number of neutrons

How many electrons can the first energy level of an atom hold?

• Six
• Four
• Two
• Eight

Where are protons and neutrons located within an atom?

• In the first energy level
• In the outermost shell
• In the nucleus
• In the electron cloud

Which subatomic particle is positively charged and contributes to the mass of an atom?

• Isotopes
• Protons
• Neutrons
• Electrons

What is the role of neutrons in an atom?

• Storing energy
• Determining the charge
• Contributing to the mass
• Determining the element identity

Which subatomic particle is negative in charge and does not contribute to the mass of an atom?

• Protons
• Neutrons
• Electrons
• Isotopes

What determines the mass of an atom?

• The number of protons
• The number of electrons
• The number of neutrons
• The number of isotopes

When is an ion considered positively charged?

• When it has an equal number of protons and electrons
• When it has no neutrons
• When it has more electrons than protons
• When it has more protons than electrons

How do isotopes affect the mass of an element?

• They average the mass of different versions of the element
• They decrease the number of electrons
• They increase the number of protons
• They change the charge of the element

What determines the mass of an element when considering different isotopes?

• The number of electrons
• The number of protons
• The number of neutrons
• The average of all isotopes