2007-08-22 06:52:15 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
The simple answer is 20, but the units would not be amu, but rather Daltons. And this is probably OK for a question you would have on the high school or even basic college chemistry level. But the correct answer is 19.9924401 amu.
AMU is based on 1/12th the mass of carbon-12 and accounts both for the mass of electrons and for the nuclear mass defect in C-12. However, the mass defect does not vary linearly with the number of nucleons and therefore does not translate directly to Ne-20. So its mass defect is larger.
2007-08-22 07:25:48 · answer #1 · answered by anotherhumanmale 5 · 0⤊ 0⤋
An AMU is basically the mass of a proton OR a neutron as they have roughly the same mass. Electrons also have a mass, but it is so small that they are considered negligible. One protron = One neutron = 1 AMU, so the answer to your question is 20...10+10.
If you look at almost any periodic table of the elements you will see that Neon is element number 10 (indicating the number of protons) and it has an atomic mass of 20. That 20 comes from the number of protons plus the number of neutrons.
2007-08-22 13:59:41 · answer #2 · answered by Buck B 1 · 0⤊ 0⤋
the mass of a single proton and a neutron is taken as 1 amu. Since the Ne atom has total 20 neutrons and protons so its mass will be 20 amu
2007-08-22 13:58:32 · answer #3 · answered by shivam 1 · 0⤊ 0⤋
Since the electrons have an insignificant mass, the mass is just P + N, where P is the number of protons and N is the number of neutrons.
P + N = 10 + 10 = 20 atomic mass units
2007-08-22 13:55:37 · answer #4 · answered by lithiumdeuteride 7 · 0⤊ 0⤋
Atomic Mass: 20.1797 amu
2007-08-22 13:56:29 · answer #5 · answered by originalsmartie 4 · 0⤊ 1⤋
20.
2007-08-22 14:46:40 · answer #6 · answered by GalNextDoor 4 · 0⤊ 0⤋