2006-09-03 05:05:18 · 7 answers · asked by Bangks 1 in Science & Mathematics ➔ Chemistry
add the number of protons to the number of neutrons... however if you look of the periodic table, the numbers you see there are not whole numbers. This is because they take account of the abundance of the different types of isotopes in the enviornment.
For example. Hydrogen naturally is just one proton and one electron (no neutrons). However is you look on the chart, it was the atomic weight is 1.008 (not 1.000). The "8" does not come from the electrons (electrons have very little mass and does not attribute to the mass of the atom). The "8" comes from the different isotope of hydrogen (one proton, one neutron and one proton, two neutrons). If 99.2% all all hydrogen is 1p0n, and 0.8% is 1p1n, and 0.0% is 1p2n, you would add it up like:
1 x .992 = .992
2 x .008 = .016
3 x .000 = .000
where .992 + .016 + 0 = 1.008
2006-09-03 05:07:21 · answer #1 · answered by Anonymous · 0⤊ 0⤋
How To Determine Atomic Weight
2016-11-18 05:32:45 · answer #2 · answered by ? 4 · 0⤊ 0⤋
How Is Atomic Weight Determined
2016-12-30 18:51:32 · answer #3 · answered by ? 4 · 0⤊ 0⤋
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RE:
How can we determine the atomic weight of an atom.?
2015-02-03 17:52:08 · answer #4 · answered by Anonymous · 0⤊ 0⤋
The atomic weight of the most common isotope of every atom is on the periodic table.
2006-09-03 05:07:53 · answer #5 · answered by Kevin H 7 · 0⤊ 1⤋
The atomic weight is the average weight of an atom of that element.
It is averaged because most elements are a mixture of different isotopes of that element, which have different weights.
2006-09-03 05:23:19 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Atomic weight=Number of Protones + Number of Neutrones
2006-09-03 05:11:01 · answer #7 · answered by Amar Soni 7 · 1⤊ 1⤋
go there and print out a chart
2006-09-03 05:07:16 · answer #8 · answered by Anonymous · 0⤊ 1⤋