Figure 1.

Biologically relevant metals found in organisms. Life is primarily based on the six bulk elements H, C, N, O, P, and S (blue), which are involved in basic biological organic chemistry. Alkali metals are highlighted in yellow, alkaline earth metals are shown in orange, and d-block metals, which include transition metals and group 12 metals (Zn and Cd), are presented in light red. f-block elements are not shown but their positions are indicated for lanthanides (₅₇La*) and actinides (₈₉Ac**).