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2006-10-25 12:31:32 · 6 answers · asked by fansari31 2 in Science & Mathematics ➔ Chemistry
thanks Cirric!
2006-10-25 12:37:04 · update #1
The average atomic mass (more usually called the relative atomic mass) is the mass of the one mole of atoms the element compared with the mass of one mole of carbon. As most elements are made up of atoms with slightly different masses (called isotopes) the average is not usually a whole number e.g. chlorine gas is made of mainly (75%) chlorine atoms of mass 35 with some atoms (25%) weighing 37. The average of these is 35.5. Carbon has a whole number (12.000) as its atomic mass is the one the rest are compared with.
2006-10-25 12:46:27 · answer #1 · answered by Anonymous · 0⤊ 0⤋
"The periodic table reports average atomic mass, a weighted average of the atomic mass of an element’s isotopes. A weighted average takes into account the relative importance of each number in the average. Thus, if there is more of one isotope in a typical sample, it affects the average atomic mass more than an isotope that is less abundant does.
For example, carbon has two stable isotopes found in nature, carbon- 12 and carbon-13. The average atomic mass of carbon takes into account the masses of both isotopes and their relative abundance. So, while the atomic mass of a carbon-12 atom is exactly 12 amu, any carbon sample will include enough carbon-13 atoms that the average mass of a carbon atom is 12.0107 amu."
2015-02-25 16:22:32 · answer #2 · answered by Allie 1 · 0⤊ 0⤋
This was my answer to a previous question, I'll just paste it since it applies here too.
Lets take carbon for example. There are two naturally stable occurring isotopes. Carbon-12 and carbon-13. So in any given amount of carbon you will have some that have a atomic mass of carbon-12 and some with carbon-13. To be specific it is 98.89% carbon-12 and 1.11% carbon-13. So to get the true average mass we must incorporate both of these.
2006-10-25 12:38:37 · answer #3 · answered by ence 2 · 0⤊ 0⤋
Hi. Isotopes have different numbers of neutrons and it's the average (not always a whole number) that is the atomic mass.
2006-10-25 12:34:37 · answer #4 · answered by Cirric 7 · 0⤊ 0⤋
area 51 has those elements and wont give any out
2006-10-25 12:34:11 · answer #5 · answered by Anonymous · 1⤊ 0⤋
math is still very young....kinda like the Hawaiian language...only 12 letters.
2006-10-25 12:39:46 · answer #6 · answered by Anonymous · 0⤊ 0⤋