) Calculate the atomic weight of Cerium Ce when the following information is kno
ID: 983640 • Letter: #
Question
) Calculate the atomic weight of Cerium Ce when the following information is known. Show all calculation steps you have used:
Isotope
Atomic Mass
Natural Abundance
136Ce
135.907amu
0.185%
138Ce
137.906amu
0.251%
140Ce
139.905amu
88.45%
142Ce
141.909amu
11.11%
5pts.
2)
a) What elements in the periodic table tend to lose electrons?
b) What elements in the periodic table tend to gain electrons?
c) What is the name for the following ionic species:
a) BrO4-
b) IO2-
c) Au3
Isotope
Atomic Mass
Natural Abundance
136Ce
135.907amu
0.185%
138Ce
137.906amu
0.251%
140Ce
139.905amu
88.45%
142Ce
141.909amu
11.11%
Explanation / Answer
1) atomic weight = [sum of(atomic mass of isotope x isotopic abundance%)]/100
= [(135.907 x 0.185) + (137.906 x 0.251) + (139.905 x 88.45) + (141.909 x 11.11)]/100
= [25.143 + 34.614 + 12374.597 + 1576.609 ]/100
= 140.10963 g
2)
a) Element which tend to loose electrons in the periodic table : Metals loose electrons
b) Element which tend to gain electrons in the periodic table : Non-metals gain electrons
c) Name of the ionic species,
a) BrO4- : perbromate ion
b) IO2- : iodite ion
c) Au3 : auric ion
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