What is the inner transition metal in period 7 that starts with the letter E?

The inner transition metal in period 7 that starts with the letter "E" is Einsteinium (Es). It is a synthetic element and part of the actinide series, which includes elements typically found below the main body of the Periodic Table. Einsteinium was first discovered in 1952 in the debris of a thermonuclear explosion and is primarily used for research purposes.