Name the unit used to express size of an aton
Subject
Topic
Level
Junior High
Grade
9

Answer

The unit used to express the size of an atom is called:

Atomic Radii.

The atomic radius is a measure of the size of an atom. The atomic radius is defined as one-half the distance between the nuclei of two identical atoms that are bonded together.

r is atomic radius of an atom and d is distance between the nuclei of two identical atoms

Atomic radius is dependent on the type of bond present. Types of bonds can be grouped as five descriptive types.

  • Ionic bonds
  • Covalent bonds
  • Metallic bonds
  • van der Waals bonds
  • Hydrogen bonds

Units used to measure atomic radius:

  • Angstroms (Å): This the most common unit used. Equivalent to 1.0 x 10-10 meters.
  • Nanometer (nm): Equivalent to 1.0 x 10-9 meters.
  • Picometer (pm): Equivalent to 1.0 x 10-12 meters.

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