|Jan29-12, 12:08 AM||#1|
Doubts regarding Atomic mass,relative atomic mass and mass number.
I was reading my science textbook and they have introduced the concepts of atomic mass,relative atomic mass and mass number.Here are some doubts I have-
1)Is atomic mass a ratio ?
2)1/12th of a C-12 atom is half a proton,half a neutron and half an electron.Since mass of an electron is negligible and since 1 proton=1 neutron,1/12th of a C-12 atom is basically the mass of one proton or one neutron.A hydrogen atom has 1 proton so why didn't they take 1u = mass of 1 hydrogen atom?
3)Also,if 1u = mass of a proton = mass of a neutron aren't mass number and atomic mass the exact same thing ?
4)In my book the atomic mass of Chlorine is given as 35.5.How can an atom have half a neutron or proton ?
5)Can someone please explain what relative atomic mass is along with an example as in my book just the definition is given and I couldn't understand a thing.
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|Jan29-12, 03:46 AM||#2|
35*0.76 + 37*0.24 = 35.5
I dunno what you mean by "relative atomic mass". The word "relative" probably comes from the fact that you measure the mass of an atom relative to the C-12 atom. If an atom has isotopes in nature, its mass is usually given as a weighted average of the masses of its isotopes (as I explained just above).
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