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An atom with an atomic mass of 89 and an atomic number of 39 has how many neutrons?
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2. Atoms & Elements
The Atom
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Where is most of the atom's mass located?
A
In the outermost shell
B
Evenly distributed throughout the atom
C
In the nucleus
D
In the electron cloud
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Recall the basic structure of an atom, which consists of a nucleus at the center and electrons surrounding it in various shells or energy levels.
Understand that the nucleus contains protons and neutrons, which are much more massive than electrons.
Recognize that electrons, which occupy the outermost shells or electron cloud, have negligible mass compared to protons and neutrons.
Therefore, most of the atom's mass is concentrated in the nucleus because it contains nearly all the protons and neutrons.
Conclude that the correct answer is: most of the atom's mass is located in the nucleus.
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