Answer to Question #101502 in General Chemistry for Arjun

Question

What could be a measuring device and an electron in an quantum theory analogy?

Answer 1

The electron mass was measured using a device called the Penning trap, which, using a combination of magnetic and electric fields, allows you to capture and hold charged particles in a specific area of ​​space. An ion consisting of the nucleus of a carbon atom, the mass of which is already known with fairly high accuracy, and one electron was "captured" in this trap. It turned out that the mass of the electron is 0.000548579909067 units of atomic mass, daltons (Da), the main non-systemic unit for measuring the mass of elementary particles, equal to 1/12 of the mass of the nucleus of a carbon atom.