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In a simplified model of subatomic particles, the mass number of an atom is determined by which of the following?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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Atoms of which element contain 25 protons?
A
Cobalt (Co)
B
Manganese (Mn)
C
Chromium (Cr)
D
Iron (Fe)
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Recall that the number of protons in an atom defines the element's atomic number.
Look up the atomic numbers of the given elements: Cobalt (Co), Manganese (Mn), Chromium (Cr), and Iron (Fe).
Identify the element whose atomic number is 25, since the atomic number equals the number of protons.
Use the periodic table to find that Manganese (Mn) has an atomic number of 25.
Conclude that atoms of Manganese contain 25 protons.
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