2006-11-28 19:47:20 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
the rarest of the platinum group (PGM) is iridium
http://en.wikipedia.org/wiki/Iridium
http://www.platinuminfo.net/pgm_ir.html
http://www.platinuminfo.net/pgm.html
platinum
http://www.blanchardonline.com/blanchard_products/bullion_platinum.php
2006-11-28 19:52:01 · answer #1 · answered by Bitstorm 3 · 2⤊ 0⤋
between lanthnum and hafnium is a chain of 14 factors cerium to lutetium, which could be the customary inner transition sequence. they're often called lannthanide sequence or uncommon earth. So the customary uncommon earth is Ce or cerium.
2016-12-14 08:46:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I think it's either polonium of iridium.
Neither of those have special properties, other than being shiny. They both are used as catalysts for some specific reactions, but almost everything can be used to catalyze something.
2006-11-28 19:51:31 · answer #3 · answered by tgypoi 5 · 0⤊ 0⤋
It seems from the attached diagram to be iridium. The diagram excludes radioactive metals, which appear as decay products then decay themselves.
2006-11-29 03:04:48 · answer #4 · answered by Anonymous · 1⤊ 0⤋
I'm not sure whether Diamond is a metal or not... but it isn't listed in the Peiodric Table, so i'm guessing it's not a metal then...
But I think the rarest metal must be gold... my anwser is only supported by how people always fuss about gold and want gold!
2006-11-28 19:50:40 · answer #5 · answered by silvs 5 · 0⤊ 6⤋