뒤로CH.E Chemical context of life
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이 집합의 용어 (10)
Matter
Anything takes up space and mass- elements and compounds
Element
Substance cannot be broken down into others thru chemical reactions
Compound
substance made of two or more elements in a fixed ratio
Atomic number
Protons in nucleus
Atomic Mass
atoms total mass --> Aproximated by mass number
Mass #
protons + neutrons in a nucleus
Isotopes
two atoms of an element that differ in # of neutrons
Radioactive Isotopes
Decay spontaneously + give off particles and energy
Chemical 'behavior'
determined by electron distribution
Valence electrons
electrons in outermost shell