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20 terms

Structure of Matter

STUDY
PLAY
atom
the smallest part of an element
atomic
having to do with the atom
meson
particles that hold protons and neutrons together
density
how tightly packed a material is the amount of mass an object has compared to its volume
neutron
the neutral part of the atom on the inside of the atom
decomposition
when the molecules break into smaller particles
liquid
a substance that can be poured and takes the shape of the container
quarks
small particles that make up protons and neutrons
compound
a material formed joining elements
atomic number
number of protons in an element
mass
the amount of material in something
gas
a material that has no form and takes the shape of the container
gluons
hold the quarks together
element
matter made of one kind of material
combination
the action when one atom joins with another to form a new substance
nucleus
the middle of the atom
solid
the material that has a definite shape
mass number
the number of protons and neutrons in the nucleus of the atom
proton
the positive part of the atom on the inside of the atom
electron
the negative part of the atom