Relative atomic mass
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Why periodic table masses are often decimals

Why periodic table masses are often decimals

Mixture of naturally occurring chlorine atoms showing many chlorine-35 atoms, fewer chlorine-37 atoms, and a weighted average relative atomic mass of 35.5

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. Because neutrons add mass, different isotopes of the same element do not all have exactly the same mass.

Relative atomic mass Lesson

  1. GCSE
  2. /Chemistry
  3. /Relative atomic mass