Question

according to the reactivity series which metals are highly reactive moderate reactive and not reactive at all?

Answer 1

iron is moderate..
potassium is highly..
plantinum is least

Answer 2

The arrangement of metals in  a vertical column in the order of decreasing re activities is called as Reactivity series of metal or activity series.

In this series, the most reactive metals are placed at Top :
Lithium, Potassium, Barium, Calcium,sodium, Magnesium, Aluminium.

Moderate reactive metals are placed at Middle:
Zinc, Iron, Nickel,Tin, Lead 

Least reactive metals are placed at bottom:
Copper,Mercury, silver,Gold,Platinum.