كروم (Cr)
كروم is the chemical element with atomic number 24 and symbol Cr. It is a فلز انتقالي in period 4, group 6, with a standard atomic weight of 51.996 u.
حقائق أساسية
- Z
- 24
- Atomic weight
- 51.996 u
- Category
- فلز انتقالي
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1797
- CAS
- 7440-47-3
الخصائص المقيسة
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.66 | National Center for Biotechnology Information (NIH) |
| Melting point | 2,180 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 2,944 K | National Center for Biotechnology Information (NIH) |
| Density stp | 7.15 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 189 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 652.9 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 64.3 kJ/mol | National Center for Biotechnology Information (NIH) |
التوزيع الإلكتروني
- Noble gas notation
- [Ar] 3d⁵ 4s¹
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
- Electrons per shell
- 2, 8, 13, 1