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12 Cards in this Set

  • Front
  • Back

Compound

permanent combination of elements.


exist as molecules

Element

basic building blocks of other things/substances. Held together by bonds.


Exist as Atoms

Bonds

Connections of elements in a compound.


Two types of Bonds: Ionic & Covalent

Ionic Bond

has an electrostatic attraction.


The total positive(+) charge must be equal to the total negative (-) charge.


Ionic bonds form between something with a + charge and something with a - charge.


Most often, the charge is a metal-except when the compound contains NH4.


Characteristics: High water solubility. High Melting Point. Solution Conducts Electricity. High Boiling Point.

ions

Charged substances

Electrostatic Attraction

Attraction between a + charge and a - charge

Covalent Bonds

million times more common than ionic bonds




elements share electron pairs, so that each element involved contains the same # of outer shell electrons just as its nearest noble gas




form between nonmetals

Covalent bond Element:


Hydrogen

1A


Hydrogen (H)- (can pair with another hydrogen to be


=> H-H=H2


can form 1 bond

Covalent Bond Element:


Fluorine

7A element=7 electrons
can form one bond
Covalent Bond Element:
Oxygen

Oxygen=O
6A element=6 electrons
can form two bonds

Nitrogen

Nitrogen=N


5A element=5 electrons


can form three bonds

Carbon

Carbon=C


4A element=4 electrons


can form 4 bonds