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24 Cards in this Set

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