I'm in bio and i'm like the only freshman in there bc our states laws changed so now we skip earth science like all the freshman in the past have so yeah... what is the mass number of hydrogen? Mass is like the number of neutrons added right? And all there is in an atom is the one proton and electron... so is it zero??? please help!!!!
2006-09-26 13:48:56 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Mass is approximately the number of neutrons plus number of protons because they both have a mass of 1. Electrons weigh something like 1/1847 the amount of a proton or neutron. The atomic mass number on the periodic table is actually an average based on the relative abundance or scarcity of isotopes, i.e. C-12, C-14 are carbon isotopes. The atomic number is the number of protons or number of electrons. So for hydrogen, the atomic weight is probably something like 1.00007676, i.e. close to but not exactly zero.
2006-09-26 14:00:16 · answer #1 · answered by spongeworthy_us 6 · 0⤊ 3⤋
One. Or usually one. The mass number (also called "atomic mass index") is the total of the number of protons plus the number of neutrons.
Hydrogen usually has one proton and no neutrons.
Other isotopes contain one or even two neutrons, but these are usually called by the special names deuterium and tritium.
Because of these other isotopes, the average atomic mass (not atomic number) is 1.008 amu.
2006-09-26 20:50:46 · answer #2 · answered by Richard 7 · 5⤊ 0⤋
Molar Mass of Hydrogen
nH2,pTagBox[SubscriptBox["n", RowBox[List[SubscriptBox[StyleBox["H", Rule[SingleLetterItalics, False]], "2"], ",", FormBox["p", TraditionalForm]]]], DisplayForm]=mH2,pTagBox[SubscriptBox["m", RowBox[List[SubscriptBox[StyleBox["H", Rule[SingleLetterItalics, False]], "2"], ",", FormBox["p", TraditionalForm]]]], DisplayForm]MH2TagBox[SubscriptBox["M", SubscriptBox[StyleBox["H", Rule[SingleLetterItalics, False]], "2"]], DisplayForm]SubscriptnSubscriptH2pSubscriptmSubscriptH2pSubscriptMSubscriptH2-1
The reaction Zinc and Hydrogen stoichiometry presented in
Equation 1.2, “Oxidation of Zinc by Hydrochloric Acid Reaction Step 2”
is reflected in
Equation 1.6, “Zinc and Hydrogen Stoichiometry”
.
2006-09-26 21:23:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The molecular mass (if that's what u'r referring to) of H2 is 1.008. It's not the number of protons added with neutrons. That refers to isotops.
2006-09-26 20:54:41 · answer #4 · answered by Anonymous · 0⤊ 1⤋
The mass number is the decimal # that is usually beneath the symbol for the element.
In Hydrogen it's 1.0; in Na (Sodium) it's 23.0; Cu (Copper) 63.5; etc...
2006-09-26 20:50:24 · answer #5 · answered by Kristina 3 · 0⤊ 1⤋
A great source for this and other quick science questions is www.wikipedia.org
2006-09-26 20:57:48 · answer #6 · answered by Anonymous · 0⤊ 1⤋
The mass # is 1.008!
2006-09-26 20:50:43 · answer #7 · answered by FlashGordon 3 · 0⤊ 2⤋