#synthetic elements notes

[er-cryptid]

Einsteinium

-- Es

-- synthetic

-- atomic number 99

-- mass number is 252

-- period 7

-- F-block

-- actinide

-- electron configuration is [Rn] 5f^11 7s^2

-- solid at STP

-- silvery color

-- soft

-- glows blue in the dark

-- melting point is 1133 K

-- boiling point is 1269 K

-- discovered in 1952

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