What is are the most expensive chemical element per kilogram?

Question

it can also be by gram. pls give me at least ten elements

Answer 1

Neptunium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Medelevium, Nobelium, Lawrencium.

At least 9 of these were "predicted" elements, known to exist only when created synthetically. Basically, they possibly exist somewhere in the universe but only exist on earth in minute amounts when artificially created.

Since they don't actually seem to exist on Earth, that males them priceless.

Answer 2

Do you mean accessible by the general populace? Probably platinum as a metal or carbon as a gem (in diamond form, not a metal). But heavier metals carry a hefty price, like uranium or plutonium, for example. The most costly are the elements that are high on the periodic element chart, because they take a lot of effort to create and observe. Those ones usually have a very short half-life, so they wouldn't be something you could own. BTW, you didn't specify value by mass or by volume

Answer 3

Here are the approximate prices for rare six metals, last updated in mid June 2007 (price change in last month) price per troy ounce
Rh Rhodium Prices$ 6070 (-4%)
Pt Platimum Prices$ 1280 (-3%)
Au Gold Prices$ 655 (-2%)
IrI ridium Prices$ 450 (steady)
Pd Palladium Prices$ 369 (+3%)
Ag Silver Prices$ 13.18 (-1%)

http://www.curiousnotions.com/home/metals.asp
http://elementsales.com/
Weapons grade material would be more valuable but not the pure elements. of uranium, plutonium etc

Answer 4

Platinum

Answer 5

uranium, plutonium, platinum, gold

rest you can check out market prices and see if they fit within your category of "most expensive"

Answer 6

platinum ?