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Unit B-2 Words
Question | Answer |
---|---|
state of matter | The three phases matter can be in |
solid | Molecules that are compacted together |
liquid | Molecules that are held together with a weak force of attraction |
gas | Molecules that are spread out all over the place |
atom | The smallest particle there is |
proton | The positive charges of an atom |
neutron | The neutral charges of an tom |
nucleus | the center of an atom |
electron | The parts of an atom that circle the atom |
electron cloud | Where an electron can be at any given point in time |
valence electron | The outermost electrons |
Periodic Table of Elements | An arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus) |
reactivity | How much a substance reacts with another substance |
atomic number | The number of protons |
mass number | Protons+neutrons |
atomic mass | The mass rounded to the nearest whole number |
element | one of the 100’s of elements that cannot be broken down |