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Chap. 2
Atoms
Question | Answer |
---|---|
matter | anything that has mass and takes up space |
atom | tiny particles that matter is made up of |
element | substances that are made of only one type of atom |
proton | positive electric charge |
neutron | no electric charge |
electron | negative electric charge |
atomic number | the number of protons and electrons in an atom |
mass number | number of protons plus the number of neutrons |
isotope | same elelment but different numbers of neutrons |
compound | contains atoms of more than one type of element that are chemically bonded together |
ions | electrically charged atoms |
mixture | two or more substances not chemically combined |
heterogeneous mixture | not mixed evenly and each component retains its properties |
homogenous mixture | evenly mixed throughout |
solution | another name for homogenous mixture |
density | number of the measure of mass of an object divided by its volume |