Biology Chepter 2

Matter

anything that takes up space
Element
- sustance that cannot be broken down into other
- substences
Compound

consisting of two or more different elements in a fixed ratio- _{characteristics different than the indivigual element}
Essential Elements
- things that an organism needs to live healthfuly and to reproduce- oxygen, carbon,
- hydrogen, nitrogen ect.
Trace Elements

elements only needed in minute quantities
Atomic Number

number of protons

Author

Anonymous

101888

Card Set

Biology Chepter 2

Description

chem basics

Updated

2011-09-15T13:41:45Z