Periodic Table
Found on the left side
Metals
Atomic number
Number of Protons
Tend to give up electrons
Metals
The matter stays the same
Physical reaction
When two are more atoms bond
They form a Molecule
Found on the right side
Non-metals
Subtract atomic weight from atomic number
Neutrons
Tend to accept electrons
Non-metals
The matter changes
Chemical reaction
When shells are full or empty
Atoms are Stable
Found in the middle
Metalloids
H2, N2, and O2
examples of Elements
Vertical columns
Groups
A reaction that absorbs energy
Endothermic
Most common type of bond
Covalent
Elements on the far right are called.
Noble Gases
HCl, H2O, & CO2
Examples of Compounds
Horizontal rows
Periods
Reaction that releases energy
Exothermic
Charged atoms
Ions
Number of known elements
118
Horizontal rows indicate the number of
Shells
Vertical columns show number of outer valence
Electrons
Increase of rate of a reaction
Catalysts
Maximum number of valence electrons
8