What are the least reactive metals?

All are listed from the most reactive metal to the least in BOLD:

NB: This list is incomplete. Never on the internet have I found a complete list.

These must be extracted via electrolysis, react with acids, cold water, and tarnish quickly

Francium < radioactive and reacts explosively; the most reactive.
Cesium
(other metals in group 1 and 2)
Lithium
Potassium
Strontium
Calcium
Sodium
Lithium
Calcium
Magnesium < Though it is considered very reactive, it reacts very slowly with water

These metals can be extracted by reduction by carbon, react slowly with acids, do not react with cold water (room temperature water), but react with steam and tarnish slowly.

Aluminum
Carbon
Zinc
Chromium

These don't react with steam.

Iron
Cadmium
Cobalt
Nickle
Tin
Lead

All Metals below hydrogen do not react with acids, nor water, but still tarnish in air very slowly. These are extracted by decomposing their oxides (heating).

Hydrogen
Antimony
Arsenic
Bismuth
Copper
Mercury
Silver < Can still be dissolved by nitric acid.
Gold
Paladium
Platinum < very unreactive, but not the least reactive.
(other metals)

It gets a bit more complicated here. The list above is a basic list of reactivity with normal acids. However some of these metals can still be dissolved.

These metals can be dissolved by aqua regia (royal water; concentrated mixture of nitric and hydrochloric acid)

Copper
Gold
Platinum
Ruthenium < dissolved in aqua regia in the presence of oxygen.
Rhodium < must be pulverized to react with aqua regia.

These do not react with aqua regia (they are very very very unreactive)

Niobium
Tantalum

Finally, what is regarded as the least reactive metal of all time (drum roll):

Iridium