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42 Cards in this Set

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molecule
the smallest electrically neutral unit of a substance that still has the properties of the substance
diatomic
molecule made of 2 atoms
triatomic
molecule made of 3 atoms
monotomic
molecule made of 1 atom
2 properties of a monotomic molecule
stable and nonreactant
why do atoms band with other atoms?
to achieve stability
what kind of elements don't generally react with other atoms
noble gases
why don't noble gases generally react with other atoms
because they are stable as they are
2CO
3 name the coefficient and subscript and what they mean
coefficient-2-refers to the entire molecule
subscript-3-refers to the thing right before it
what do you do first, subscript or coefficient?
subscript
characteristics of molecules (3)
1. low melting point
2. low boiling point
3. generally are gases
characteristics of ionic compounds
1. high melting and boiling pt.
2. solid at room temp.
3. crystalline
4. do not conduct electricity in the solid state
electronegativity
a tendancy of an atom to attract electrons when it is chemically combined with another element
why is there no way to measure the electronegativity of noble gases?
because they don't react with any other atoms
on the reference table, where are the atoms with greatest electronegativity and the least electronegativity?
greatest=upper right
least=lower left
ionic bond
transfer of electrons
covalent bond
sharing of electrons
when does an ionic bond result
results when the difference of the electronegativity is 1.7 or greater
when does a covalent bond result
when the difference of electronegativity of the atoms is less than 1.7
which kind of elements have high electronegavitiy and which have low
high-nonmetals
low-metals
what is an ionic bond between
metal and nonmetals
2 kinds of ionic compounds
1. binary
2. ternary
binary ionic compounds
2
ex. AB
which lose and which gain electrons
metals lose, nonmetals gain
ternary ionic compounds
3
ex. ABC
cation
any atom or group of atoms that has a positive charge; metals
anion
an atom of group of atoms with a negative charge; nonmetals
how do you get an atom to be stable
give it a complete outer shell
stable octet
stable outer shell
formula unit
what we call any ionic compound-must be neutral
other names for formula unit
chemical compounds or ionic compounds
polyatomic ions
have more than one atom
what must the net ionic charge of the formula be?
zero
what does the ionic formula show
the relationship (ratio) between the components
when are parentheses used in formulas
when there is more than one polyatomic ion
when is an ion that looks like a polyatomic ion not a polyatomic ion?>
when it has no charge
stock system
roman numerals
what elements give up electrons
nonmetals
which elements gain electrons
metals
waht does it mean when it is an -ide ending
the ion is an element and an anion
what kind of charge do metallic ions have
positive
what kind of charge do nonmetallic ions have
negative