2007-05-09 03:52:54 · 9 answers · asked by Jasmine 1 in Science & Mathematics ➔ Chemistry
thx everybody for helping me.
2007-05-09 04:40:27 · update #1
If u can, answer my another question.
2007-05-09 04:41:52 · update #2
The relative atomic mass of an element is the average of the atomic masses of all the chemical element's isotopes as found in a particular environment, weighted by isotopic abundance.
Chlorine has two isotopes available in Nature.
One has At.mass = 35 which forms roughly 75% of the naturally available Chlorine.
Another has At.mass = 37 which forms roughly 25% of the naturally available Chlorine.
Let X be the atomic mass of Chlorine
X = 0.75*35 + 0.25*37 = 35.5
which is the atomic mass of Chlorine.
You can see that its not a whole number.
Similar case is for the element Copper, Iron etc
2007-05-09 04:01:02 · answer #1 · answered by Som™ 6 · 4⤊ 0⤋
Chlorine Atomic Mass
2016-10-04 21:09:04 · answer #2 · answered by suero 4 · 0⤊ 0⤋
How could it be?
The atomic mass of chlorine listed in the periodic table is a weighted average of the masses of all the different isotopes of chlorine. Add to that the fact that the masses of each isotope are not integers (Chlorine 35 [75.784% abundance] has a mass of 34.968852571 g/mole, Chlorine 37 [24.224% abundance] has a mass of 36.96590260 g/mole), and there are 22 other isotopes from Chlorine 28 to Chlorine 51) and it becomes readily apparent that it would be a mathematical fluke if the listed atomic mass came out to be an integer.
2007-05-09 04:08:53 · answer #3 · answered by Dave_Stark 7 · 0⤊ 0⤋
There are 2 stable isotpes of chlorine
Cl 35 (17 protons and 18 neutrons)
Cl 37 (17 protons and 20 neutrons)
Both are stable and the natural proportion is near 3/4 for Cl 35
So , natural chlorine is a mixture with noninteger mass
2007-05-09 04:04:18 · answer #4 · answered by maussy 7 · 1⤊ 0⤋
It's a weighted average. Basically, it means that on average, each chlorine atom weighs whatever the mass is. However, about 75 percent of the chlorine atoms in the world weigh 35 daltons (grams per mol), and another 20-some percent weigh 37 daltons. So the average one weighs about 35.5 daltons.
2007-05-09 04:01:14 · answer #5 · answered by Brian L 7 · 1⤊ 0⤋
coz chlorine has two isotopes.
Cl(17p,18n)
Cl(18p,18n)
hence the sum of atomic mass is 35+36=71
since it has 2 isotopes,the atomic mass is 71/2=35.5
which is not a whole number.
2007-05-09 04:42:21 · answer #6 · answered by ashay s 2 · 0⤊ 0⤋
The atomic masses of most elements are not whole numbers because they are average values of weight. Every single atom of oxygen does not weigh exactly 16amu, and every atom of carbon is not exactly 12. It is an average of all of the potential isotopes of that element.
2007-05-09 04:02:52 · answer #7 · answered by Seiko K 2 · 1⤊ 1⤋
isotopes are atoms with different number of neutrons but same number of protons . chlorine has some isotopes in the nature and its atomic mass changes in base of them this is why we use average atomic mass for calculating its atomic mass
2007-05-09 04:02:37 · answer #8 · answered by anastasia 2 · 1⤊ 1⤋
a) Chlorine atoms can have different number of neutrons.
2016-04-01 03:45:37 · answer #9 · answered by ? 4 · 0⤊ 0⤋