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Ivahew [28]
3 years ago
5

The average atomic mass recorded on the periodic table for cobalt is 58.933 u. This indicates that the most abundant isotope of

cobalt is ____.
A.) cobalt-57
B.) cobalt-58
C.) cobalt-59
D.) cobalt-60
Chemistry
1 answer:
OleMash [197]3 years ago
7 0
The average atomic mass of the element is the sum of the products of the percentage abundance of isotope and its mass number. Therefore, for atomic mass equal to 58.933, the most abundant isotope is cobalt-59. Thus, the answer is letter C. 
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Answer:

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When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.  Where as,

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