The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

This discussion is now closed.

Check out other Related discussions

Mass spec , question

Q: Why does a mass spectrometer trace only one peak for fluorine whilst that for bromine shows 2 peaks.

Any ideas?

Cheers :smile:
Reply 1
Avatar for belle_27
belle_27
14
Bromine has 2 isotopes; 79Br and 81Br. Flourine only has one isotope.
Reply 2
Avatar for Zoob
Zoob
13
:ditto:
Reply 3
Avatar for Wangers
Wangers
16
are all halogens about 3:1 ratios?
no, as the above posts point out - Fluorine only has one isotope
Reply 5
Avatar for Doji
Doji
OP
17
any reason why?
Reply 6
Avatar for A Y A Z
A Y A Z
11
Bromine exists as [Br-79,Br-79] [Br-79,Br-81] [Br-81,Br-81]

Flourine doesn't.
Reply 7
Avatar for Democracy
Democracy
20
Fluorine has 1 isotope. Therefore only that is registered by the mass spec
Reply 8
Avatar for Morgan141
Morgan141
2
Zakz
any reason why?

I don't believe there are any specific rules to how many isotopes an element has (or at least no rule you have to learn at AS-level anyway), it's just one of those things you have to accept.
Reply 9
Avatar for Wangers
Wangers
16
charco
no, as the above posts point out - Fluorine only has one isotope


No, I get that, sorry should have been clearer, I mean the others - like Bromine and Iodine. etc.
No, I get that, sorry should have been clearer, I mean the others - like Bromine and Iodine. etc.


There is only one stable isotope of flourine, 18 F.

Chlorine have two stable isotope, 35 Cl and 37 Cl at 3:1 ratio

Bromine have two stable isotopes, 79 Br and 81 Br at about 1:1 ratio

There is only one stable isotope of iodine, 127 I
I imagine that is a typo and should read 19F
yes, it is 19F sorry about the typo and thanks for pointing it out :p:
Reply 13
Avatar for Doji
Doji
OP
17
oh cheers....just thought maybe there was a reason Fluorine only had 1 isotope... but im okay with not knowing that reason :biggrin:

Related discussions

Latest

Trending

Trending

Articles for you