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The Elements 0f Life
Chapter 2, pg 31-40
12
Anatomy
Undergraduate 1
01/24/2013

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Term
Element
Definition
substance that cannot be reduced to a simpler substance by normal forces such as heat, electricity, magnetism, or a chemical reaction
Term
atom
Definition
the smallest particle of an element that behaves like the element
Term
proton
Definition
positively charged atomic particle that is found in the nucleus 
Term
Electric charge
Definition
they possess electrical energy
Term
atomic number
Definition
explains the number of protons in the nucleus of the atom. 
Term
isotope
Definition
atoms with the same number of protons but different numbers of neutrons
Term
Electron shells (orbitals)
Definition
the paths along which the electrons move 
Term
anion
Definition

negatively charged ion

 

Term
cation
Definition
positively charged ion
Term
bulk elements vs. trace element
Definition

elements which must be obtained daily in the diet in large quantities

oxygen

nitrogen

hydrogen 

carbon

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