What is the rarest metal on Earth?
user
I can try to find out for you.  Would you like to see a list of some of the rarest metals?
assistant
Sure!
user
Okay, here are some examples of the rarest metals, from low to high:

Yttrium
Thulium
Osmium
Iridium
Platinum
Rhenium
Gold
Mercury
Silver
Ruthenium
Germanium
Tantalum
Uranium
Rubidium
Sulfur
Dysprosium
Niobium
Dysprosium
Neodymium
Lead
Sulfur
Iridium
Tantalum
Platinum
Indium
assistant
What is the rarest metal on Earth?
user
I can try to find out for you.  Would you like to see a list of some of the rarest metals?
assistant
Sure!
user
Here are some metal density estimates:

Atomic number, 8 - Platinum

Atomic number, 21 - Rhenium

Atomic number, 47 - Ruthenium

Atomic number, 72 - Darmstadtium

Atomic number, 80 - Osmium

Atomic number, 85 - Iridium

Atomic number, 93 - Chromium

Atomic number, 94 - Molybdenum

Atomic number, 107 - Hafnium

Atomic number, 112 - Tantalum

Atomic number, 114 - Tungsten

Atomic number, 118 - Rutherfordium
assistant
What is the rarest metal on Earth?