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This is a stable isotope of sulfur: 1616S.
The chemical symbol for fluorine isotope with 9 neutrons is 18F (18 is a superscript).
18F
231
Ca Calcium
This is a stable isotope of sulfur: 1616S.
Ag-109
no symbol
The chemical symbol for fluorine isotope with 9 neutrons is 18F (18 is a superscript).
Any atom with an atomic number of 10 is indeed neon. Most such atoms may have only 10 neutrons, but those with 12 neutrons are another isotope of neon. Since the mass number of an isotope is the sum of the numbers of protons and neutrons, the mass number of this isotope is 22, and one way of writing its symbol is 22Ne.
18F
This is the isotope plutonium-240: 24094Pu.
The chemical symbol is Ne. An isotope is writted as: 2010Ne (20 is the atomic mass of the isotope, 10 is the atomic number of Ne).
This an isotope of osmium, osmium-191. The symbol is 19176Os.
238U
17P 15
Which isotope of what element? We need a little more information here in order to be able to help you. However, the most common isotope of Oxygen has 8 neutrons. I hope this answers the question. If not, please try resubmitting with more information.