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The number of neutrons in any element depends on the isotope of the element you are referring to. Potassium has 24 isotopes, ranging from 32K to 55K. The most stable natural isotope is 39K, which would have 20 neutrons.
204/80 Hg^2+
238U
17P 15
Each isotope, stable or unstable, has a specific symbol; for example K-40 for potassium 40.
An isotope of potassium with 22 neutrons has an atomic number of 19 and atomic mass of 41. The symbol is K with a subscript 19 and superscript 41.
The number of neutrons in any element depends on the isotope of the element you are referring to. Potassium has 24 isotopes, ranging from 32K to 55K. The most stable natural isotope is 39K, which would have 20 neutrons.
204/80 Hg^2+
no symbol
The chemical symbol for fluorine isotope with 9 neutrons is 18F (18 is a superscript).
18F
This is the isotope plutonium-240: 24094Pu.
The mass number is always the sum of the numbers of protons and neutrons and therefore is 39 in this instance. The atomic number of 19 shows that the atom is of the element potassium, and its symbol is 39K.
This an isotope of osmium, osmium-191. The symbol is 19176Os.
Potassium and it has 19 electrons and protons and 20 neutrons. Potassium and it has 19 electrons and protons and 20 neutrons. Potassium and it has 19 electrons and protons and 20 neutrons.
238U
17P 15