1. most abundant elements
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Anything that has weight and takes up space
Matter
Four
most abundant elements
Oxygen
Carbon
Hydrogen
Nitrogen
These are created when atoms can combine with atoms like themselves or with other atoms by forming attractions.
Chemical bonds

2. An element from the periodic table An element from the periodic table
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Parts of an atom
Parts of an atom
PROTON
NEUTRON
ELECTRON
NUCLEUS
An element from the periodic table
An element from the periodic table Li 3
6.941
Lithium Li 3
6.941
Lithium 1
Atomic number
(also # of protons)
(also # of electrons) 2
Atomic weight
This is formed when two or more atoms of the same element bond
Molecule

3. Maximum number of electrons in the first three inner shells of an atom
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This is formed when two or more atoms of different elements bond
Compound
Maximum number of electrons in the first three inner shells of an atom
First shell: 2
Second shell: 8
Third shell: 8
Helium is more stable because its outermost shell is filled.
Which element is more stable?
Why?

4. Ionic bond Covalent bond Polar covalent bond
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Ionic bond
Formed when atoms gain or lose electrons
Covalent bond
Formed when atoms share electrons
This is formed when a polar molecule has an equal number of protons and electrons, but one end of the molecule has more than its share of electrons, becoming slightly negative, while the other end of the molecule has less than its share, becoming slightly positive.
Polar covalent bond

5. Hydrogen bond Ionic bond Covalent bond
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Formed between an electropositive atom and an eletronegative atom
Hydrogen bond
What type of bond is this?
Ionic bond
What type of bond is this? H2
Covalent bond

6. Molecular formula Hydrogen bond Polar covalent bond H2O H O
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What type of bond is this?
Hydrogen bond
electropositive
electronegative H O
What type of bond is this?
Polar covalent bond
The symbols of the elements in the molecule together with numbers to indicate how many atoms of each element are present.
Example:
Molecular formula
H2O