Elements and the Periodic Table
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is half-life in the context of radioactive isotopes?
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay into a different element or isotope.
2.
FLASHCARD QUESTION
Front
Why are radioactive isotopes useful in determining the ages of rocks and fossils?
Back
Radioactive isotopes decay at a predictable rate, allowing scientists to calculate the age of materials based on the remaining amount of the isotope.
3.
FLASHCARD QUESTION
Front
What state of matter are most nonmetals at room temperature?
Back
More than half of the nonmetals are gases at room temperature.
4.
FLASHCARD QUESTION
Front
What are the general properties of metals?
Back
Metals are typically malleable, ductile, and good conductors of electricity.
5.
FLASHCARD QUESTION
Front
What is the difference between an element and an isotope?
Back
An element is defined by its number of protons, while isotopes are variants of an element that have the same number of protons but different numbers of neutrons.
6.
FLASHCARD QUESTION
Front
What is beta radiation composed of?
Back
Beta radiation consists of particles that are identical to electrons.
7.
FLASHCARD QUESTION
Front
What are the characteristics of nonmetals?
Back
Nonmetals are generally poor conductors of heat and electricity, and they can be gases, liquids, or brittle solids.
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