like with neon.. the atomic mass is 20.18 but what does that indicate?
2007-05-11 21:28:39 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
It's the mass of an atom at rest, measured in unified atomic mass units (amu). It's subtly different from relative atomic mass. Relative atomic mass is calculated based on the relative abundance of the various isotopes of an element, whereas atomic mass is the mass of a specific isotope. Don't let the units throw you. It's just another unit of mass like grams or kilograms (or pounds, ounces, etc. if you prefer) which is arbitrarily constructed to save dealing in fiddly numbers like 1.6606 times 10 to the power of minus 27 (approximate equivalent in grams to 1 amu). See link.
2007-05-11 21:34:05 · answer #1 · answered by Grimread 4 · 1⤊ 0⤋
the unit of atomic mass is the 1/12 of the mass of the Carbon 12.
More practically the atomic mass = nomber of protons (Z) + number of neutrons (N)
A= Z+N
2007-05-11 21:47:24 · answer #2 · answered by maussy 7 · 0⤊ 0⤋
thats is relative atomic mass. Its a 'scale', if you will, that has carbon-12 as 12 "mass units'.
Its like, how "heavy" it is in comparison to carbon 12
Its calculated by using the relative isotope masses of the element, and their corresponding percentage abundances
2007-05-11 21:32:11 · answer #3 · answered by Anonymous · 0⤊ 1⤋
The sum of protons and neutrons. The atomic number is always an integer, because it is the number of protons. The atomic mass, however, is not an integer because it takes into account the isotpes
2007-05-11 21:32:29 · answer #4 · answered by Sam and I 3 · 1⤊ 1⤋
protons and neutrons in the nucleus
2016-04-01 07:48:11 · answer #5 · answered by Anonymous · 0⤊ 0⤋
what it weighs in comparison to having no air? maybe it's how much to suffocate people with?
2007-05-11 22:40:07 · answer #6 · answered by bryan_q 7 · 0⤊ 2⤋