Chapter 12 (6)

Question 1

ATOM

Answer 1

the smallest unit of an element that still has the properties of that element

Question 2

PROTON

Answer 2

a subatomic particle that has a POSITIVE charge

Question 3

NUCLEUS

Answer 3

the center of an atom, usually containing protons and neutrons

Question 4

NEUTRON

Answer 4

a subatomic particle that has the same mass as a proton but no electric charge

Question 5

ELECTRON

Answer 5

a subatomic particle that orbits an atom’s nucleus, has a negative electric charge, and has very little mass

Question 6

ATOMIC NUMBER

Answer 6

the number of protons in an atom

Question 7

ELEMENT

Answer 7

a substance made up of only one kind of atom

Question 8

METAL

Answer 8

a substance that conducts heat and electricity well and that is malleable

Question 9

NONMETAL

Answer 9

a substance that does not conduct electricity and that is not malleable

Question 10

PERIODIC TABLE

Answer 10

a table that shows the elements arranged by their atomic numbers

Question 11

COMPOUND

Answer 11

a substance made up of atoms of two or more elements that are chemically combined

Question 12

MELTING POINT

Answer 12

the temperature at which a solid changes from a solid to a liquid

Question 13

BOILING POINT

Answer 13

the temperature at which a substance changes from a liquid to a gas

Question 14

PLASMA

Answer 14

a state of matter made up of charged atoms, uncharged atoms, and free electrons