Atomic Mass Calculation

What is the atomic mass of Sodium?

• 11

• 22.990

• 33.990

• 11.990

What is the atomic mass of "F"

• 9

• 18

• 17

• 19

The atomic mass of an atom is

• Protons + electrons

• Neutrons + electrons

• Protons + neutrons

• The number of protons

Which particles are considered when calculating the atomic mass of an element?

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Only protons

The atomic mass of carbon is approximately 12 amu. What does this value represent?

• The number of protons in carbon

• The number of neutrons in carbon

• The average mass of carbon atoms, including isotopes

• The mass of a single carbon atom

How is the atomic mass unit (amu) defined?

• 1/12 the mass of a carbon-12 atom

• The mass of a single hydrogen atom

• The mass of a single proton

• The mass of a single neutron

Which isotope of hydrogen has an atomic mass of approximately 2 amu?

• Protium

• Deuterium

• Tritium

• None of the above

If an element has two isotopes with atomic masses of 10 amu and 11 amu, and the average atomic mass is 10.8 amu, which isotope is more abundant?

• The isotope with 10 amu

• The isotope with 11 amu

• Both isotopes are equally abundant

• Cannot be determined

What is the atomic mass of an element with 20 protons, 20 neutrons, and 18 electrons?

• 38 amu

• 40 amu

• 20 amu

• 18 amu

Which of the following elements has an atomic mass closest to 16 amu?

• Carbon

• Oxygen

• Nitrogen

• Fluorine