Einsteinium

Einsteinium (symbol Es) is a chemical element, atomic number 99 on the periodic table.

Characteristics and history
Einsteinium, in its most stable form, has an atomic mass of 254. Einsteinium was discovered by Humans on Earth's North American continent for the first time by scientists working in the United States in the year 1952. This element is part of the actinide series of heavy elements, and was named for Albert Einstein.