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Americium  Am (Element 95) of Periodic Table

Americium Am (Element 95) of Periodic Table

95 Am (Americium)

Appearance – Silvery white, Shiny

Mass number – 243

Atomic number (Z) – 95

Atomic weight – 243.0614 g/mol

Electrons – 95

Protons – 95

Neutrons – 148

Period – 7

Block – f

Element category – Actinide

Electrons per shell – K2, L8, M18, N32, O25, P8, Q2

Electron Configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f77s2

Phase – Solid

Melting point – 1449 k (1176 oC)

Boiling point – 2880 k (2607 oC)

Density – 12 g/cm3

Half Life(s) – 233×109

Lifetime(s) – 336×109

Decay mode – α decay

Neutron cross section (Barns) – 74

Thermal conductivity (W/m*k) – 10

Heat of fusion – 14.39 kJ/mol

Molar heat capacity – 62.7 J/(mol•k)

Oxidation states – 8, 7, 6, 5, 4, 3, 2

Electronegativity – 1.3

Ionization energies – 1st: 578 kJ/mol

Atomic radius – 173 pm

Covalent radius – 180±6 pm

Crystal structure – Double Hexagonal close-packed

Grid parameters – a=3.468, c=11.24

Attitude c/a – 3.24

Thermal conductivity – 10 W/(m•k)

Electrical resistivity – 0.69 μΩ•m

Magnetic ordering – Paramgnetic

Magnetic susceptibility (xmol) –  +1000.0-6 cm3/mol

CAS Number – 7440-35-9

Naming – After the Americas

Discovery – Glenn t. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso (1944)

Isotopes – 241Am 242m1Am 243Am

Uses – It  is commonly used in smoke alarms, It has the potential to be used as a nuclear battery or fuel for space ships with nuclear propulsion in the future.

Biological role – It is toxic due to its radioactivity.

Natural abundance – Americium occurs naturally in uranium minerals, but only in trace amounts. The main source of the element is the neutron bombardment of plutonium in nuclear reactors. It is also formed when nuclear weapons are detonated

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