Multiple Choice
The isotope Carbon-14 has a half-life of 5,730 years. How many years must pass for a sample of Carbon-14 to break down to ¼ of its original amount?
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2. Cell Chemistry & Cell Components
Isotopes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Phosphorus-32 (radioactive) has __________ than phosphorus-35 (normal).
A
three more neutrons
B
three more protons
C
three fewer protons
D
three fewer neutrons
Verified step by step guidance1
Identify the atomic number of phosphorus, which is 15. This means every isotope of phosphorus has 15 protons.
Understand that isotopes of an element have the same number of protons but different numbers of neutrons.
Calculate the number of neutrons in phosphorus-32 by subtracting the atomic number from the mass number: 32 - 15.
Calculate the number of neutrons in phosphorus-35 by subtracting the atomic number from the mass number: 35 - 15.
Compare the number of neutrons in phosphorus-32 and phosphorus-35 to determine the difference in neutron count.
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