Einsteinium Element in Periodic Table | Atomic Number Atomic Mass

Einsteinium Element:

Einsteinium is a radioactive chemical element of the actinoid series of the periodic table. It was the seventh transuranium element (the chemical elements with atomic numbers greater than 92) to be discovered. The element named after Albert Einstein. Its atomic number is 99 and represented by the symbol Es. Einsteinium does not occur in nature and it is produced by the neutron bombardment of plutonium in a nuclear reactor. It has 19 known isotopes with atomic masses ranging from 240 to 258 and it has no stable isotopes. ²⁵²Es is the longest lived isotope, has half-life 471.7 days.

Uses Of Einsteinium Element:

• Einsteinium is mainly used for scientific research purposes. Since it is toxic due to radioactivity, its biological role is negligible.

Einsteinium Element Information:

Discovery year:1952

Discovered by:Lawrence Berkeley National Laboratory

Atomic number: 99

Relative atomic mass: [252]

Electron configuration: [Rn] 5f¹¹ 7s²

Block: f-block

Other elements in the same block:

Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Fermium, Mendelevium, Nobelium and  Lawrencium are the elements in the same block.

Period: period 7

Other elements in the same period:

Francium, Radium, Actinium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Fermium, Mendelevium, Nobelium, Lawrencium, Rutherfordium, Dubnium, Seaborgium, Bohrium, Hassium, Meitnerium, Darmstadtium, Roentgenium, Copernicium, Nihonium, Flerovium, Moscovium, Livermorium, Tennessine and Oganesson

Group: Actinides

Other elements in the same group:

Thorium, Protactinium, Uranium, Plutonium, Americium,  Curium, Berkelium, Californium, Fermium, Mendelevium, Nobelium and Lawrencium are the elements in the same group.

Other elements in the same orbital:

Actinium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Fermium, Mendelevium, Nobelium and Lawrencium are the elements in the same orbital.

Allotropes: none

Key isotopes: ²⁵²Es

Melting point: 860°C, 1580°F, 1133 K 

Boiling point: unknown

Element category: actinide 

Density (g cm⁻³): unknown

CAS number: 7429-92-7

Color: silvery

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