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UNIT 3 REVIEW. Elements. If the formula has ONE CAPITAL LETTER, it is an element, and its name is what is found on the periodic table (regardless of subscript). IONS. Positive ions are named for the element Na+ is the ‘sodium ion’ Negative ions end in ‘-ide’ Cl - is the “chloride ion”

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elements
Elements

If the formula has ONE CAPITAL LETTER, it is an element, and its name is what is found on the periodic table (regardless of subscript)

slide3
IONS

Positive ions are named for the element

Na+ is the ‘sodium ion’

Negative ions end in ‘-ide’

Cl- is the “chloride ion”

Check table E for polyatomic ions (like NO3-)

slide4
all TWO element compounds (two capital letters) end in –IDE, whether molecular or ionic

NF3 nitrogen trifluoride

CaCl2 calcium chloride

slide5
MOLECULAR COMPOUNDS:

- start with a NON-METAL

- use PREFIXES in the name

P2O5

diphosphorus pentoxide

slide6
IONIC COMPOUNDS:

- start with a METAL

- NO prefixes in name

- if given name write SYMBOL and CHARGE above names to find formula

slide7
KF potassium fluoride

Mg2+ P3-

magnesium phosphide

Mg3P2

slide8
If the metal can have more than one charge, use ROMAN NUMERALS in the name:

Cu2+ Cl-

copper (II) chloride CuCl2

slide9
if non-metal is POLYATOMIC ION, compound ends in –ITE or –ATE:

KNO3 potassium nitrate

Na2SO4 sodium sulfate

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