Natural Occurrence of the Elements In the periodic table there are 3 natural occurrence of the elements : Primordial, From decay and Synthetic.The first 94 elements occur naturally; the remaining 24, americium to oganesson...

Periodic table block A block of the periodic table is a set of groups of chemical elements whose valence electrons occupy, in the ground state, orbitals that share the same azimuthal quantum number ℓ,...