Name: Tantalum

Atomic Symbol and Mass Number: Hf [73]

Electron Configuration: [Xe] 4f     5d    6s 

Atomic Radii: 146 pm

Electron Affinity: 31 kJ mol‑1

Oxidation States:+5,+4,+3,+2,+1, -1, -3

Electronegativity Value: 1.5

Elemental Group: Transition Metal

Uses and Properties:

• Tantalum is dark (blue-gray), dense, ductile, very hard, easily fabricated, and highly conductive of heat and electricity.

• The metal is renowned for its resistance to corrosion by acids; in fact, at temperatures below 150 °C tantalum is almost completely immune to attack by the normally aggressive aqua regia.

• Tantalum is a silvery metal that is soft in its pure form.

• It is a strong and ductile metal and at temperatures below 150°C (302°F), this metal is quite immune to chemical attack.

• It is known to be resistant to corrosion as it displays an oxide film on its surface

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Lewis Diagram: