2007-09-04 07:19:37 · 5 answers · asked by charles j 2 in Science & Mathematics ➔ Chemistry
You get the neutron number. The mass number is just the
sum of the atomic (proton) number and the neutron number.
2007-09-04 07:24:42 · answer #1 · answered by Reginald 7 · 0⤊ 0⤋
The mass of an atom is the mass of the protons, neutrons and electrons. Electrons weight about one ten thousandth of a proton or neutron. If you take the number of protons away from the atomic mass you get approximately the number of neutrons. This is true for most common elements.
It is slightly more complex than this as you get different isotopes of each element e.g. Carbon 12, 13 and 14. These have the same number of protons (6) but different numbers of neutrons (6, 7 or 8). The atomic mass is a weighted average of the masses of these isotopes, taking into account how common each isotope is. e.g. Carbon is 12.0107 as there are many more C12 atoms around than C13 or C14.
2007-09-04 14:28:41 · answer #2 · answered by SpiceBoy 2 · 0⤊ 0⤋
The number of neutrons!
2007-09-04 14:23:21 · answer #3 · answered by Gervald F 7 · 0⤊ 0⤋
the number of neutrons
2007-09-04 15:07:41 · answer #4 · answered by something_sweet 2 · 0⤊ 0⤋
the number of neutrons in the nucleus
2007-09-04 14:24:54 · answer #5 · answered by Anonymous · 0⤊ 0⤋