2007-08-09 01:43:11 · 11 answers · asked by leera 1 in Science & Mathematics ➔ Chemistry
Because the atomic weight listed on the periodic table -- 79.904 g/mole -- is the weighted average of all the isotopes of Bromine.
The two most abundant isotopes are Br79 (50.69%) and Br81 (49.31%):
(0.5069 * 78.918338) + (0.4931 * 80.916291) = 79.90353
There is, in fact, a Bromine-80, (actual mass 79.918530), but it is an insignificant fraction of all Bromine extant.
2007-08-09 01:57:18 · answer #1 · answered by Dave_Stark 7 · 0⤊ 0⤋
Atomic Mass Of Bromine
2016-09-28 05:20:18 · answer #2 · answered by ? 4 · 0⤊ 0⤋
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The relative atomic mass of bromine is given as 80.But there are no bromine atoms that weight 80 units. why?
2015-08-06 20:40:54 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Bromine has two naturally occurring isotopes of Ar = 79 and Ar=81. Since these are practically found in a 1:1 ratio the mean value is taken which is 80. This is because any given sample of bromine used in experiments should statistically be half of 79 and half of 81 thus giving 80.
2007-08-09 01:52:59 · answer #4 · answered by SS4 7 · 0⤊ 0⤋
The value of 80 is a weighted average. That is, the average mass is calculated on the average isotopic composition.
If the masses were 50% 79 and 50% 81 then the average would be 80.
If the masses were 33% 78 and 67% 81 then the average would still be about 80.
If the masses were 25% 77 and 75% 81 the average would be 80.
2007-08-09 01:59:25 · answer #5 · answered by Anonymous · 0⤊ 0⤋
relative atomic masses are calculated as averages of all the occurring different bromine masses. around half of bromine as a mass of 81 and half has a mass of 79. when averaged together this gives an atomic weight of 80.
also bromine is a diatomic molecule and exists in nature as Br2 giving a mass of 160 incase this is what u meant.
2007-08-09 01:56:28 · answer #6 · answered by Anonymous · 1⤊ 0⤋
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Atomic Data for Bromine (Br) Atomic Number = 35 Atomic Weight = 79.904
2016-04-02 03:53:35 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Relative atomic mass of Bromine is 79.9
Bromine has two isotopes : 79Br ( abundance = 50.69 % ) and 81Br ( abundance = 49.31 %)
The atomic mass is the average of atomic masses of all chemical element's isotopes wheighted by isotopic abandance.
To get this number :
(79 x 50.69 ) + ( 81 x 49.31) / 100 = 79.9
2007-08-09 01:54:04 · answer #8 · answered by Dr.A 7 · 1⤊ 0⤋
Br Atomic Mass
2016-12-16 12:38:12 · answer #9 · answered by sosnowski 4 · 0⤊ 0⤋
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2015-08-04 04:19:16 · answer #10 · answered by Elvira 1 · 0⤊ 0⤋