Multiple Choice
Which pair of nuclide notations represent isotopes of the same element?
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4. Atoms and Elements
Isotopes
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Which element is represented by an atom with 13 protons and 14 neutrons (i.e., atomic number )?
A
Aluminum (an isotope of aluminum, mass number )
B
Sodium (atomic number )
C
Silicon (atomic number )
D
Magnesium (atomic number )
Verified step by step guidance1
Identify the atomic number of the atom, which is the number of protons. Here, the atomic number is given as 13.
Recall that the atomic number uniquely determines the element on the periodic table. Each element has a specific atomic number corresponding to its number of protons.
Look up the element with atomic number 13 on the periodic table. This element is Aluminum (Al).
Calculate the mass number of the isotope by adding the number of protons and neutrons: \$13 + 14 = 27$.
Recognize that this atom is an isotope of Aluminum with a mass number of 27, written as \(^{27}\text{Al}\).
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