8. Europium is the element responsible for the red phosphors in a colour TV screen. The mass spectrum of the isotopes of europium is shown below. (a) How many protons are there in an atom of the most abundant isotope? (b) How many neutrons are there in an atom of the most abundant isotope? (c) How many electrons are there in an atom of the most abundant isotope? (d) If the mass of one isotope is 150.91985 amu and the mass of the other isotope is 152.92122 amu, calculate the atomic weight of europium and report it to the correct number of significant figures based on the data given.
8. Europium is the element responsible for the red phosphors in a colour TV screen. The mass spectrum of the isotopes of europium is shown below. (a) How many protons are there in an atom of the most abundant isotope? (b) How many neutrons are there in an atom of the most abundant isotope? (c) How many electrons are there in an atom of the most abundant isotope? (d) If the mass of one isotope is 150.91985 amu and the mass of the other isotope is 152.92122 amu, calculate the atomic weight of europium and report it to the correct number of significant figures based on the data given.
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Transcribed Image Text:8. Europium is the element responsible for the red phosphors in a colour TV screen. The mass spectrum
of the isotopes of europium is shown below.
(a) How many protons are there in an atom of the most abundant isotope?
(b) How many neutrons are there in an atom of the most abundant isotope?
(c) How many electrons are there in an atom of the most abundant isotope?
(d) If the mass of one isotope is 150.91985 amu and the mass of the other isotope is
152.92122 amu, calculate the atomic weight of europium and report it to the correct number of significant
figures based on the data given.
Relative number of atoms
100-
80
60-
40-
20-
0-
Mass spectrum of europium
47.8%
t
151
Mass number
52.2%
152 153
Expert Solution
Step 1
#8:
We are given the mass spectrum of the isotopes of the element Europium(Eu).
According to the given isotope,
Eu-153 isotope has an abundance of 52.2 % or a fraction abundance of 0.522.
Eu-151 isotope has an abundance of 47.8 % or a fraction abundance of 0.478.
Hence Eu-153 is the most abundant isotope.
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