click below
click below
Normal Size Small Size show me how
Module 1-2
Question | Answer |
---|---|
element | a pure substance that cannot be broken down into any simpler substance (oxygen) |
molecule | a particle that contains more than one atom joined together |
molecule example | water is made of hydrogen and oxygen |
compound | a substance that is formed by the chemical combination of two or more elements (salt) |
physical change | change in appearance, state and volume |
elements are organized by | atomic mass |
why is called the periodic table? | the properties of the elements repeat in cycles |
proton | positively charged particles in the nucleus |
neutron | particles without charges in the nucleus |
electron | negatively charged particles that circle the outside of an atom |
nucleus | the center of an atom made of proton and neutrons |
physical properties | odor, color, density, mass, texture and appearance |