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Atoms and Molecules
Term | Definition |
---|---|
atom | basic building block of matter |
matter | anything that has mass and takes up space |
mass | the amount of matter that makes up a substance |
volume | the space taken up by a substance |
proton | subatomic particle found in the nucleus of an atom which has a positive charge |
neutron | subatomic particle found in the nucleus of an atom which has a neutral charge |
electron | subatomic particle found outside the nucleus of an atom which has a negative charge |
job of proton | determines the identity of an atom |
job of neutron | holds the nucleus together |
job of electron | involved in chemical reactions |
atomic number | the number of protons or electrons |
atomic mass | the number of protons + neutrons |
periodic table | chart of known elements organized by atomic number |
molecule | atoms bonded together to form a new substance |