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238U
17P 15
The symbol is Ba. The number of neutrons equal the number of protons.
204/80 Hg^2+
The mass number 5 is not compatible with the number of neutrons 10.
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.
This an isotope of osmium, osmium-191. The symbol is 19176Os.
238U
17P 15
231
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.
Ca Calcium
The symbol is Ba. The number of neutrons equal the number of protons.
Antimony (symbol Sb) has three isotopes: 121Sb, 123Sb, and 125Sb. The 121 isotope has 70 neutrons, and the 123 isotope has 72 neutrons. The 125 isotope isn't stable and will decay, but it has 74 neutrons.