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For every 100 K-40 atoms that decay, 11 become Ar-40.

http://isratalk.ru/ [HEURISTICS] [NUMBERS AND MATH] [UNITS AND MEASURES] [ELEMENTS] [PERIODIC TABLE] [STATES OF MATTER] [COMPOUNDS] [REACTIONS] [MOLS, PERCENTS, AND STOICHIOMETRY] [REDOX AND ELECTROPLATING] [GASES] [SOLUTIONS] [ACIDS AND BASES] [KINETICS] [THERMOCHEMISTRY]And you thought you were strange Atomic weights and atomic numbers. The neutrons and protons are in the center of the atom in a nucleus.

If one of these protons is hit by a beta particle, it can be converted into a neutron.

With 18 protons and 22 neutrons, the atom has become Argon-40 (Ar-40), an inert gas.

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Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).

The electrons are outside the nucleus in electron shells that are in different shapes at different distances from the nucleus. Ernest Rutherford shot subatomic particles at a very thin piece of gold.

Most of the particles went straight through the gold.

It was like shooting a rifle into a thin line of trees.

Some of the particles bounced off, some stuck inside, but the major portion of them passed through the gold foil.