75Re186.207
Transition Metald-block
Rhenium
Element 75 on the periodic table, symbol Re, group 7, period 6.
Rhenium is a chemical element with symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.
Appearance: silvery-grayish
Properties
- Atomic Number
- 75
- Atomic Mass
- 186.2071 u
- Group
- 7
- Period
- 6
- Block
- d-block
- Category
- Transition Metal
- State at 25 °C
- Solid
- Melting Point
- 3,459 K · 3,185.9 °C
- Boiling Point
- 5,869 K · 5,595.9 °C
- Density
- 21.02 g/cm³
- Atomic Radius
- 135 pm
- Electronegativity
- 1.9
- Oxidation States
- +4, +7
- Abundance in Crust
- 7.00e-4 mg/kg
- Discovered
- 1925
- Discovered By
- Masataka Ogawa
Electron Configuration
[Xe] 4f14 5d5 6s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d5
Ionisation Energies (kJ/mol)
- 1. 760
- 2. 1,260
- 3. 2,510
- 4. 3,640
Elements near Rhenium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.