What is the Atomic Number of the element Einsteinium?

99

The correct answer is option (3) 99.

Einsteinium is a synthetic element with the symbol Es and the atomic number 99. Being a synthetic element means that it is not found naturally on Earth and must be produced through artificial means. It was first discovered in the debris of the first hydrogen bomb test in 1952.

The atomic number of an element is the number of protons found in the nucleus of an atom of that element. In the case of Einsteinium (Es), it has 99 protons in its nucleus, distinguishing it from other elements on the periodic table. The atomic number is a fundamental property of an element and is used to define its place in the periodic table.

In summary, the atomic number of Einsteinium is 99, reflecting the number of protons in the nucleus of an Einsteinium atom.