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4.MA2AtomicStrucure
atoms, subatomic particles
Term | Definition |
---|---|
matter | anything that takes up space and has mass |
mass | the amount of matter in something |
volume | the amount of space something takes up |
atoms | building block of matter |
nucleus | center of the atom; contains all the mass, protons, and neutrons |
proton | positively charged subatomic particle; located in nucleus- identifies what kind of element it is |
neutron | zero charge subatomic particle; located in nucleus |
electron | negatively charged subatomic particle, tiny; located in electron cloud around the nucleus |
electron cloud | area around the nucleus where electrons are located; different energy levels where electrons tend to be |
atomic number | number of protons in an atom; identifies the element |
atomic mass | mass or weight of an atom- average mass of protons AND neutrons |
AMU | SI unit to describe the mass of an atom and its subatomic particles |
element | simplest form of matter that is a pure substance; organized on Periodic Table and is made up of one type of atom |
compound | pure substance of 2 or more chemically bonded elements |
mass number | exact number of protons AND neutrons in an element/atom |