What is the half-life of a radioactive substance?
Nuclear and Stars 24H

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•
Chemistry
•
9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The half-life is the time required for half of the radioactive atoms in a sample to decay.
2.
FLASHCARD QUESTION
Front
How do you calculate the number of half-lives that have passed?
Back
Divide the total time elapsed by the half-life of the substance.
3.
FLASHCARD QUESTION
Front
What force causes a nebula to collapse into a protostar?
Back
Gravity is the force that causes a nebula to collapse and form a protostar.
4.
FLASHCARD QUESTION
Front
How do you determine the number of neutrons in an isotope?
Back
Subtract the atomic number (number of protons) from the mass number of the isotope.
5.
FLASHCARD QUESTION
Front
What is the mass number of an isotope?
Back
The mass number is the total number of protons and neutrons in the nucleus of an atom.
6.
FLASHCARD QUESTION
Front
What is the atomic number of an element?
Back
The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.
7.
FLASHCARD QUESTION
Front
What is the relationship between protons and neutrons in an isotope?
Back
Isotopes of an element have the same number of protons but different numbers of neutrons.
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