Why is the relative atomic mass of Chlorine is 35.5 Watch

Healthy_Learner
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Yeah, I don't get why.

I've tried searching but I need help.
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Jammy Duel
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The average mass is 35.5, about half of chlorine atoms have a RAM of 35, the other half 36, same with every other decimal one.
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ProbablyJade
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Thank the lord
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ProbablyJade
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(Original post by ProbablyJade)
Thank the lord
ooPS I DIDN'T FNISH THE POST
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ProbablyJade
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Oh god my reply is a trainwreck
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ProbablyJade
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What i meant to say was thank the lord my revision could help me qith this question. Basically the value is an average o all the isotopes taking into account the relative abundance
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Healthy_Learner
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Thanks!

Good luck to all tomorrow
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Jackster45
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If a element has more than one isotope the relative atomic mass takes account of the relative abundance and RAM mass of each isotope, for chlorine (I think) about 3/4 is Cl-35 and about 1/4 is Cl-37, giving 35.5 overall, though I very much doubt this is necessary to know. The values will be different for each atom obviously, but that is the general idea.
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Jono-Wolf
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(Original post by Jammy Duel)
The average mass is 35.5, about half of chlorine atoms have a RAM of 35, the other half 36, same with every other decimal one.
That's incorrect mate :/
There are two isotopes of Chlorine. Cl-35 and Cl-37. On average 75% of the atoms are Cl-35 and 25% are Cl-37. Therefore on average the atomic number is 35.5.
35+35+35+37 = 142
142 / 4 = 35.5
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Jammy Duel
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(Original post by Jono-Wolf)
That's incorrect mate :/
There are two isotopes of Chlorine. Cl-35 and Cl-37. On average 75% of the atoms are Cl-35 and 25% are Cl-37. Therefore on average the atomic number is 35.5.
35+35+35+37 = 142
142 / 4 = 35.5
It's been a while (5 to be precise) but the general point is correct

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CheeseIsVeg
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That is the average weighted mass of an atom of chlorine compared to 1/12th the mass of an atom of carbon-12
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My Chem Teacher should be proud I remembered that
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