Recognised as Chemical element
Platinum
- Pt
- Z = 78
- transition metal
Platinum (Pt) is element 78, a transition metal in period 6 and group 10. Its standard atomic weight is 195.08 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolPt
Standard atomic weight195.08atomic mass units (Da)
Mass in kilograms3.2393796 × 10^-25
Categorytransition metal
Group10
Period6
Blockd-block
Electrons in a neutral atom78
Neutrons in the most common isotope117≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹ground state, subshells written in order of n
Noble gas shorthand[Xe] 4f¹⁴ 5d⁹ 6s¹
Electrons per shell2, 8, 18, 32, 17, 1K, L, M and outward
Electrons in the outer shell1
Unpaired electrons2Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleBrokenthe measured ground state differs from the filling-order prediction, 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁸ 6s²
Quantities
Molar mass195.08 g/mol
Mass of one mole195.08 grams
Atoms in one gram3.0870108 × 10^21
Mass of one atom3.2393796 × 10^-22 g
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Neighbouring elements
Group 10
The number
Nerdulate something else
Nothing in mind? Surprise me · today’s page