Multiple Choice
Which subatomic particle is found in the nucleus of an atom and has a positive charge?
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2. Atoms & Elements
Isotopes
Multiple Choice
Which of the following isotopes has the same number of neutrons as phosphorus-31?
A
Silicon-30
B
Sulfur-32
C
Chlorine-35
D
Argon-40
Verified step by step guidance1
Identify the number of neutrons in phosphorus-31. The atomic number of phosphorus (P) is 15, which means it has 15 protons. The number of neutrons is calculated by subtracting the atomic number from the mass number: 31 - 15 = 16 neutrons.
Determine the number of neutrons in silicon-30. Silicon (Si) has an atomic number of 14, so it has 14 protons. Calculate the number of neutrons: 30 - 14 = 16 neutrons.
Determine the number of neutrons in sulfur-32. Sulfur (S) has an atomic number of 16, so it has 16 protons. Calculate the number of neutrons: 32 - 16 = 16 neutrons.
Determine the number of neutrons in chlorine-35. Chlorine (Cl) has an atomic number of 17, so it has 17 protons. Calculate the number of neutrons: 35 - 17 = 18 neutrons.
Determine the number of neutrons in argon-40. Argon (Ar) has an atomic number of 18, so it has 18 protons. Calculate the number of neutrons: 40 - 18 = 22 neutrons.
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