What is the half-time of radiocarbon? (carbon-14)

5 years

57 years

573 years

5730 years

Carbon-14, 14C, or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Carbon-12 and carbon-13 are both stable, while the half-life of carbon-14 is 5,730 ±40 years.

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101

What is the name of the most radioactive isotope on the planet?

Which chemical element forms compounds which are typically intensely colored?

Which of the following is not a chemical element?

Which two planets are the closest in size?