Zirconium The element was identified in 1789 and first produced in its pure form and in quantity in 1925.
What chemical element, a rare and lustrous silvery-white metal, was discovered in 1803 by William Hyde Wollaston, who named it after an asteroid ?
The last element to be discovered in nature, rather than synthesised, was discovered In 1939 by Marguerite Perey. What was it?
What is the name for a set of marks stamped on gold and silver articles to attest to the genuineness of the metal and the year of testing?
