K

Potassium

Ca

Calcium

Mg

Magnesium

Al

Aluminium

Zn

Zinc

Fe

Iron

Pb

Lead

Ag

Silver

No reaction with acid

Ag

Silver

No reaction with acid

Displacement Reactions
- a metal is reactive if it combines easily with other elements eg Oxygen, Sulfur
-Potassium is very reactive. It is NEVER found uncombined in the earth. It is always found as part of a compound.
-Gold is very unreactive. It is often found in the earth uncombined
- A reactive metal can displace a less reactive from its compound