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Ch. 20 Notes
Chapter 20 notes
10
Science
9th Grade
12/10/2012

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Term
Ion
Definition
an atom that has lost or gained electrons to become charged
Term
when electrons are lost...
Definition
ion has a positive charge
Term
electrons are gained...
Definition
ion has a negative charge
Term
Ionic bond
Definition
force of attraction between 2 oppositely charged ions (electrons are transfered from one atom to another to create 2 oppositely charged ions)
Term
ionic bonds form between...
Definition
metals and nonmetals
Term
oxidation number
Definition
the charge on the atom when it s stablewith full outer energy level
Term
to write a formulas for ionic compounds:
Definition
criss cross the oxidation numbers without the signs

positive ion is writen first then the negative ion
Term
naming ionic compounds
Definition

full first name of first element with capitol letter

then first syllable of the second element with "ide" with lowercase

Hydrogen chloride

Term
covalent bond
Definition
force of attraction between 2 atoms that SHARE electrons (VERY STRONG BOND)
Term
polyatomic ion
Definition
a group of covalently bonded atoms (very strong bonds) that ehaves as an ion
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