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What is the Bohr model for potassium?

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The Bohr model for potassium contains 5 concentric circles with the element's number of protons and neutrons written in the center. Each circle after that represents an energy level, with dots indicating electrons. There are two electrons in the first energy level, eight electrons in the second and third, and one in the fourth.

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Potassium is an alkali metal with the chemical symbol K. It has an atomic number of 19, meaning that it has 19 positively charged protons. It also contains 19 electrons, which have a negative charge, and 20 neutrons, which do not hold a charge. Its atomic mass is 39.0983 atomic mass units, and it has a cubic crystal structure.

The Bohr model of atoms was created by scientist Neils Bohr in 1913. Bohr based his model on the earlier Rutherford model, making improvements and fixing incorrect assumptions. The Bohr model explains how an atom of an element can have stable electrons around its nucleus. Bohr discovered that electrons move in orbits with fixed sizes and energies, and he found that electrons can jump from one orbit to another by absorbing or emitting energy. The Bohr model shows the energy levels of each element and the electrons they contain.

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    A:

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    How is the mass number calculated for an element?

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    How do you find the mass number?

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