Multiple Choice
Which isotope of iron has 30 neutrons?
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2. Atoms & Elements
Isotopes
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Which element is represented by an atom that contains six protons and eight neutrons?
A
Nitrogen-14
B
Carbon-14
C
Oxygen-14
D
Carbon-12
Verified step by step guidance1
Identify the element by the number of protons, since the number of protons (atomic number) defines the element. Here, the atom has 6 protons.
Recall that the element with 6 protons is Carbon, because the atomic number 6 corresponds to Carbon on the periodic table.
Determine the mass number of the atom by adding the number of protons and neutrons: mass number = protons + neutrons = 6 + 8.
Calculate the mass number to find the isotope notation, which is Carbon-14 in this case.
Match the isotope notation with the given options to confirm that the atom is Carbon-14.
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