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The Structure of Matter

Tools

A	B
has only one kind of atom	element
is built to explain how something works	model
the smallest particle of water that still has the properties of water	molecule
the building block of matter	atom
center of an atom	nucleus
protons plus neutrons	mass number
balanced atom	same # of protons and electrons
proton's charge	positive
electron's charge	negative
neutron's charge	neutral, no charge
orbit the nucleus	electrons
the two lightest elements	hydrogen and helium

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