4b Transition Metals
Name SymbolAtomic numberAtomic weightBoiling pointMelting PointDensity
Titanium Ti 22 47.90 3289 C 1670 C 4.54 g/cm3
Zirconium Zr 40 91.22 4409 C 1855 C 6.50 g/cm3
Hafnium Hf 72 178.5 4605 C 2231 C 13.31 g/cm3

notes: Titanium is a very strong, lightweight metal often used in air and space craft as an alloy with aluminum and other metals.
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