Multiple Choice
Which term is defined as anything that takes up space and has mass?
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2. Atoms & Elements
The Atom
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Tin (Sn) has an atomic number of 50 and its most abundant isotope has a mass number of 120. How many neutrons are present in this isotope of tin?
A
70
B
50
C
120
D
60
Verified step by step guidance1
Identify the atomic number (Z) of tin, which is given as 50. The atomic number represents the number of protons in the nucleus of the atom.
Note the mass number (A) of the most abundant isotope, which is given as 120. The mass number is the total number of protons and neutrons in the nucleus.
Recall the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to solve for the number of neutrons: \(N = A - Z\).
Substitute the known values into the equation: \(N = 120 - 50\), which will give the number of neutrons in the isotope.
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