Question

there are 14 actonones and 14 lanthanones why,?

Answer 1

$\sqrt{12}$

Answer 2

The lanthanide and actinide series make up the inner transition metals. The lanthanide series includes elements 58 to 71, which fill their 4f sublevel progressively. ... Lanthanides have different chemistry from transition metals because their 4f orbitals are shielded from the atom's environment.