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| Ironmaiden |
 Posted: Mon Jun 30, 2008 1:51 am Post subject: Atomic mass and atomic number |
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Forum Freshman
Joined: 30 Jun 2008
Posts: 9
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I many times get confused in at. mass and number.
Is there any simple way to remember at. mass and number for the compounds commonly used?
Also, what's the difference between the 2?
Is there any relation also between the 2?
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| Robbie |
| Posted: Mon Jun 30, 2008 2:23 am Post subject: |
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Forum Ph.D.
Joined: 08 Aug 2006
Posts: 641
Location: Dublin, Ireland
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atomic number is the number of protons (i.e. the order in which they appear on the periodic table) in the nucleus of an atom.
atomic mass is protons and neutrons in the nucleus of an atom. However this may be with decimals on the end of it because of the existence of isotopes (i.e. the number of neutrons can be different for atoms of the same element/same atomic number)
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| Ophiolite |
| Posted: Mon Jun 30, 2008 6:26 am Post subject: |
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Forum Radioactive Isotope
Joined: 25 Jul 2005
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Location: Scotland
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As a consequence IronMaiden, Atomic Number will always be less than Atomic Mass. Even hydrogen, with an Atomic Number of one, has a slightly larger Atomic Mass - 1.00794 - because of the small number of isotopes of deuterium (one proton and one neutron) and tritium (one proton and two neutrons) that are present in it.
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| Zwolver |
| Posted: Mon Jun 30, 2008 2:50 pm Post subject: |
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Forum Senior
Joined: 17 May 2006
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Location: Netherlands, Limburg, Ospel
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Hmm, what about the electron weight.
In uranium that should be substantial right? But still they don't name it.
Also... The mass of the atom, increases more then just the number of parts in the core.. Helium has 4 parts in his core. Hydrogen has only 1. Still the independent weight of 2 protons and 2 neutrons is less then the weight of helium.
I tried to explain this effect at my report about atomic mass anomalies. I claimed that nucloid parts use energy -> matter translation to create a small portion of matter, to stick the core together. This mass is always there, but you can only measure it when 2 particles are combined together. If i werent dutch i could explain this a little better. But still. I found NO substantial proof.
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| Ironmaiden |
| Posted: Fri Jul 04, 2008 5:03 am Post subject: |
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I got it.
But is there some relation like atomic mass is approximately twice the atomic number? |
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| Ophiolite |
| Posted: Fri Jul 04, 2008 7:53 am Post subject: |
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Forum Radioactive Isotope
Joined: 25 Jul 2005
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Location: Scotland
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| Ironmaiden wrote: |
I got it.
But is there some relation like atomic mass is approximately twice the atomic number? |
Why don't you plot out the ratios and see what you get?
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