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Chapter 6 vocab quiz
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13
Chemistry
8th Grade
12/19/2011

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Term
atom
Definition
the smallest portion of an element that maintains the characteristics of that element
Term
nucleus
Definition
the center of an atom, contains protons and neutrons 
Term
sub-atomic particles
Definition
  • electrons ( negative charge)  
  • protons (positive charge) 
  • nuetrons (no charge)
Term
element
Definition
the smallest particle of a substance that still retains the same characteristic properties of that substance
Term
isotope
Definition
atoms of the same element that vary in their number of neutrons.
Term
periodic table 
Definition
a list of the simplest known substances
Term
atomic number
Definition
the number of protons in an atom
Term
electron shells
Definition
all of the electron orbitals or paths put together. the number of electron shells corresponds to the element's row on the periodic table. the outter most shell is called the valence shell.
Term
ionic bond
Definition
is formed when one or more electrons are transferred from one atom to another 
Term
ion
Definition

a positively or negatively charged atom

cation = positive

anion = negative 

Term
covalent bond
Definition
is formed when electrons are shared between atoms
Term
van der waals forces
Definition
the slight attraction that can develop between the oppositely charged regions of nearby molecules
Term
law of electical charges
Definition
  • opposites charges attract
  • like charges repel
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