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17 Cards in this Set

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Matter
Anything that has mass and takes up space.
Mass
a measure of the amount of matter in an object.
Indirect Evidence
a set of clues that scientists use to make logical guesses about things they cannot see or test directly.
Hypothesis
a logical guess based on direct or indirect evidence.
Atom
the basic unit of all matter, the smallest particle of an element.
Nucleus
the central part of an atom.
Neutron
a particle in the nucleus of an atom.
Electron
negatively charged particle that travels around the nucleus of an atom.
Element
matter is made up of only one kind of atom.
Symbol
a short way to write the names of an element.
Compound
a new substance that forms when atoms of different elements combine.
Molecule
the simplest particle of many compounds.
Formula
a group of symbols and numbers that stand for a compound.
Nucleus
The neutrons and protons form the middle of the atom.
Molecule
2 or more atoms jointed chemically
Chemical bond
what atoms in a molecule are held together by.
Proton
positively charged particle in the nucleus of an atom.