### Shortcut Methods

**Some important numerical values related to the f-block elements:**

- Atomic numbers: ranging from 57 to 103
- Number of f-electrons: equal to group number minus 2
- Oxidation states: commonly +2, +3 and +4
- Number of f-block metals: majority of them are metals
- Applications: nuclear reactors, lasers, magnets

**Some important numerical values related to the d-block elements:**

- Atomic numbers: 21 to 30 and 39 to 48
- Number of d-electrons: equal to group number minus 10
- Oxidation states: commonly +2, +3 and +4
- Number of d-block metals: all of them are metals
- Applications: construction, transportation, jewelry

**Additional numerical values:**

- Melting point of Tungsten (W): 3422°C
- Boiling point of Mercury (Hg): 357°C
- Density of Osmium (Os): 22.59 g/cm³
- Molar mass of Lanthanum (La): 138.91 g/mol
- Molar mass of Mercury (Hg): 200.59 g/mol