Multiple Choice
Which element is represented by an atom that has 14 protons and 14 neutrons?
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4. Atoms and Elements
Isotopes
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Tin has atomic number 50. How many neutrons are in an atom of tin-120 (Sn-120)?
A
50
B
70
C
120
D
170
Verified step by step guidance1
Identify the atomic number of tin, which is given as 50. The atomic number represents the number of protons in the nucleus of the atom.
Recognize that the notation Sn-120 refers to an isotope of tin with a mass number of 120. The mass number is the total number of protons and neutrons in the nucleus.
Recall the relationship between mass number (A), atomic number (Z), and number of neutrons (N): \(A = Z + N\).
Rearrange the formula to solve for the number of neutrons: \(N = A - Z\).
Substitute the known values into the equation: \(N = 120 - 50\). This will give the number of neutrons in the tin-120 atom.
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