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Einsteinium Es (Element 99) of Periodic Table

Einsteinium Es (Element 99) of Periodic Table

99 Es (Einsteinium)

Appearance – Silvery; glows blue in the dark (Radioactive metal)

Mass number – 252

Atomic number (Z) – 99

Atomic weight – 252.0829 g/mol

Electrons: 99

Protons: 99

Neutrons: 153

Period – 7

Block – f

Element category – Actinide

Electrons per shell – K2, L8, M18, N32, O29, P8, Q2

Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f117s2

Phase – Solid

Melting point – 1133 k (860 oC)

Boiling point – 1269 k (996 oC)

Density – 8.84 g/cm3

Valence – 4

Half life(s) –  40750000

Lifetime(s) – 58800000

Oxidation states – 2, 3, 4

Electronegativity – Pauling scale: 1.3

Ionization energies – 1st: 619 kJ/mol

Decay mode – Alpha decay

Neutron cross section (Barns) – 160

Crystal structure – Face-centered  cubic

Magnetic ordering – Paramagnetic

CAS Number – 7429-92-7

Naming – After Albert Einstein

Discovery – Lawrence  Berkeley National Laboratory  (1952)

Isotopes – 252Es 253Es 254Es 255Es

Uses – Einsteinium has no uses outside research.

Biological role – It is toxic due to its radioactivity

Natural Abundance – Einsteinium can be obtained in milligram quantities from the neutron bombardment of plutonium in a nuclear reactor

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