Question | Answer |
electron | negative charge |
proton | positive charge |
neutron | no charge |
electron cloud | outside of nucleus, holds electrons |
ionic bond | electrons are gained or lost |
covalent bond | electrons are shared |
creator of periodic table | Dimitri Mendeleev |
elements are arranged by there | properties |
there are just over _______ known elements | 100 |
physical changes | a change in physical properties |
chemical changes | produces a new substance with new properties |
chemical properties | how a substance reacts with other substances |
physical properties | observed with senses ex. color, size, shape, etc. |
separating mixtures | by hand, filtering, evaporation, heating/pressure, chromatography |
compounds | atoms or more than one element joined together |
mixture | atoms not joined together, just mixed |
solution | dissolved particles, hard to separate |
molecule | a type of compound with two or more atoms joined together. Smallest part a compound can be broken into. |
acid | sour taste, 0-7 on pH scale, conduct electricity, react with metals |
base | bitter taste, feels slippery, 7-14 on pH scale |