24 - Chromium transition metal
Discovered by Louis Nicolas Vauquelin in 1797
Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point.
H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 13 | 2 in 3s + 6 in 3p + 5 in 3d |
| 4 | 1 | 1 in 4s |
52 u Atomic Mass
1.9 Å Atomic Radius
2.94k K Boiling Point
1.39 Å Covalent Radius
7.19 g/cm³ Density
65.2 Electron Affinity
1.66 Electronegativity
6.77 eV First Ionization Energy
2.13k K Melting Point
4 Number of Shells
24 Atomic Number
2, 8, 13, 1 Electron Shell Occupations