Question

which of the following is measured in the unit amu?

atomic number
elemental abbreviation
atomic mass

Explanation:

Identify the definition of AMU

The abbreviation AMU stands for Atomic Mass Unit, which is a standard unit of mass used to express atomic and molecular weights.

Analyze the given options

• atomic number: A dimensionless integer representing the number of protons.
• elemental abbreviation: A text symbol representing the element name.
• atomic mass: The mass of an atom, which is measured in atomic mass units (AMU).

Match with the provided reference text

The text on the screen explicitly states: "Atomic Mass: The number representing the average mass of an element... Atomic mass is measured in atomic mass units (AMU)."

Answer:

• atomic number
• elemental abbreviation
• atomic mass (Correct answer)