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In Chemistry / High School | 2014-11-04

In Chemistry, in the following type of shorthand, what does the number next to the element name mean?

Hydrogen-3

Asked by PurpleUnicorn

Answer (2)

the number is the mass number
the mass number is the number of nucleons (total number of protons and neautrons in the nucleus) so in hydrogen-3 there are 3 nucleons and as hydrogen has 1 proton, there are 2 neutrons
carbon 12 has 12 nucleons (6 protons and 6 neutrons) and carbn 13 has 13 nucleons (6 protons and 7 neutrons)

Answered by jamiesm | 2024-06-10

The number next to an element name, like in "Hydrogen-3", represents the mass number, which is the total of protons and neutrons in the atom's nucleus. For Hydrogen-3, there is 1 proton and 2 neutrons. This indicates that it is an isotope of hydrogen, specifically called tritium.
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Answered by jamiesm | 2024-09-03

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