Californium
Cost per gram: $10 to $27 Million ($10 to $27 per microgram)
Cost per ounce: $766 million
#2 #5 wrong
If you want to use two systems of measurement, you *must* get the math right.
Well maybe there is a discount for bulk purchase?
I have plenty of doesn'tmatter .
#11 that's not the correct stamp. The $9.5m stamp is a magenta 1c