Fundamental constants are still constant: Atomic clocks prove stability of mass ratio of protons to electrons. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2014 ...

Save guides, add subjects and pick up where you left off with your BBC account. The relative atomic masses of elements are proportional measures. For example, the Ar for helium is 4.0, and the A r ...