For carbon, there are a lot of C-12, a couple of C-13, and a few C-14 atoms.
When you average out all of the masses, you get a number that is a little bit higher than 12 (the weight of a C-12 atom).
At the age of 18 he left for the city of Christchurch, where he had won a scholarship to Canterbury College, now the University of Canterbury.
In 1893 he graduated with first class honors in both mathematics and physical science.
He discovered the concept of nuclear half-lives and achieved the first deliberate transformation of one element into another, fulfilling one of the ancient passions of the alchemists.
Ernest Rutherford was born on August 30, 1871, in the village of Brightwater on New Zealand’s South Island.
Using the NPV of cash flow technique we would discount all cash flows in our business case at the opportunity cost of capital - in most cases the weighted average cost of capital for a company.
If you have looked at a periodic table, you may have noticed that the atomic mass of an element is rarely an even number. If you are an atom with an extra electron, it's no big deal.
As you learn more about chemistry, you will probably hear about carbon-14. C-14 is considered an isotope of the element carbon.
Bromine (Br), at atomic number 35, has a greater variety of isotopes. There are two main isotopes at 79 and 81, which average out to the 79.90amu value. While it won't change the average atomic mass, scientists have made bromine isotopes with masses from 68 to 97. As you move to higher atomic numbers in the periodic table, you will probably find even more isotopes for each element.
If we look at the C-14 atom one more time, we find that C-14 does not last forever.