Carbon-12 and carbon-13 are both stable isotopes of carbon. Carbon-12 makes up 98.89 percent of carbon in nature, while carbon-13 makes up only 1.1 percent of carbon.
On many Periodic Tables, the small number directly below the chemical symbol is the atomic mass. On mine, there is a small 12.011 under the large C for carbon. While most carbon is 12, there are naturally occurring carbon13 and carbon14, so this is an average mass of all naturally occurring isotopes, with the majority of isotopes being carbon12
The atomic mass of an element is the average of its isotopes, weighted by abundance in nature.
75.7771% But Most say roughly 75% and I don't know why that is. Why not 76%?
Isotopes have a different amount of Neutrons. The atomic mass is the sum of Protons and Neutrons. Therefore having a different number of Neutrons makes the atomic mass greater. Or vice versa. Boom. Solved.
Isotopes with greater stability tend to have higher natural abundances. This is because stable isotopes have longer half-lives, allowing them to persist in nature without decaying as rapidly as less stable isotopes. Consequently, stable isotopes accumulate over time, leading to higher natural abundances compared to less stable isotopes.
On many Periodic Tables, the small number directly below the chemical symbol is the atomic mass. On mine, there is a small 12.011 under the large C for carbon. While most carbon is 12, there are naturally occurring carbon13 and carbon14, so this is an average mass of all naturally occurring isotopes, with the majority of isotopes being carbon12
isotopes
The atomic mass of an element is the average of its isotopes, weighted by abundance in nature.
The atomic mass of an element is the average of its isotopes, weighted by abundance in nature.
This value is the atomic weight.
The weighted average for all isotopes that occur in nature for an element is its atomic weight listed on the Periodic Table of the elements.
75.7771% But Most say roughly 75% and I don't know why that is. Why not 76%?
Isotopes have a different amount of Neutrons. The atomic mass is the sum of Protons and Neutrons. Therefore having a different number of Neutrons makes the atomic mass greater. Or vice versa. Boom. Solved.
Isotopes with greater stability tend to have higher natural abundances. This is because stable isotopes have longer half-lives, allowing them to persist in nature without decaying as rapidly as less stable isotopes. Consequently, stable isotopes accumulate over time, leading to higher natural abundances compared to less stable isotopes.
Isotopes occur the most in nature. Isotopes are variants of a particular chemical element which have the same number of protons but a different number of neutrons. Quarks and leptons are elementary particles that make up matter, but they are not commonly found in nature in their isolated form.
Some elements found in nature that mainly have radioactive isotopes include uranium, thorium, and potassium. These elements have naturally occurring radioactive isotopes that decay over time, releasing energy in the form of radiation.
The most stable of any element is found free in nature. Sometimes isotopes are also found along with the most stable of an element. Isotopes usually have short half life.