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24 Cards in this Set
- Front
- Back
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Why don't the protons in the nucleus repel each other?
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They are held together by the strong nuclear forse.
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What is a subatomic particle that has a positive electric charge?
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proton
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Are the atoms in a substance the same if the substance changes states?
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Yes
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What is at the center of any atom?
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nucleus
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The number of protons in an atom is called?
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the atomic number
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What is the smallest unit of a pure substance that still has the properties of that substance?
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atom
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What is a negatively charged atomic particle that is in constant motion around the nucleus?
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electron
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What is a subatomic particle that has the same mass as a proton but no electric charge?
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neutron
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What are the subatomic particles that make up an atom?
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protons, neutron, and electrons
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What are atoms that have the same number of protons but different numbers of neutrons?
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isotopes
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What is a pure substance that's made up of only one kind of atom?
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element
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What term describes the ability to bend or roll metal into sheets?
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malleability
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What element conducts heat and electricty well?
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metal
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What are elements that do not have the characteristics of metals?
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nonmetals
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This state of matter has a definite volume but no definite shape and takes the shape of its container.
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liquid
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This state of matter has a definite shape and volume.
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solid
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What is a table of the elements arranged according to their atomic number called?
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periodic table
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This state of matter has no definite shape or volume. It take on the shape of its container and expands or contracts to fill the container.
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gas
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A compound that reacts easily with other substances and turns blue litmus paper red is called?
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acid
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Elements that occur in combination with other elements is called?
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compound
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What are the three states of matter?
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solid, liquid, and gas
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What is a gas in which some of the electrons have been removed from the atoms or molecules so that the substance has free, negatively charged electrons and positively charged ions.
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plasma
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A compound that reacts easily with other substance but turns red litmus paper blue is called?
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base
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About what percent of an atom is made up of empty space?
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almost 100 percent
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