FuseSchool: In Depth - Atomic Mass Units

What is the primary focus of this lesson?

• The structure of atoms

• The definition and use of atomic mass units

• The history of atomic theory

• Radioactive isotopes

Which element is currently used as the standard reference for defining atomic mass units?

• Hydrogen

• Oxygen-16

• Helium

• Carbon-12

What is the definition of one atomic mass unit (amu)?

• The mass of a single proton

• The mass of a single electron

• 1/12 of the mass of a Carbon-12 atom

• The mass of a Hydrogen-1 atom

What is the relative isotopic mass of a Nitrogen atom with 7 protons and 7 neutrons?

• 7

• 14

• 21

• 28