Multiple Choice
Which of the following best describes isotopes?
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4. Atoms and Elements
Isotopes
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An atom has 25 protons and 30 neutrons. Which element is it?
A
Manganese (Mn)
B
Cobalt (Co)
C
Chromium (Cr)
D
Iron (Fe)
Verified step by step guidance1
Identify the element by its atomic number, which is equal to the number of protons in the atom. Here, the atom has 25 protons, so the atomic number is 25.
Recall that each element on the periodic table is uniquely defined by its atomic number. Use the atomic number to find the corresponding element.
Look up the element with atomic number 25 on the periodic table. This element is the one with 25 protons.
Note that the number of neutrons (30 in this case) does not affect the identity of the element but contributes to the isotope of that element.
Conclude that the element with 25 protons is Manganese (Mn), based on its atomic number.
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