Respuesta :

FE is iron CO is cobalt CU is copper K is potassium NI is nickle MN is magnemese

Answer:

K, Mn

Explanation:

In a periodic table, the elements are arranged in order of increasing atomic number. The atomic numbers of the given elements are:

Fe  - 26

Mn - 25

Cu - 29

Co - 27

K - 19

Ni - 28

Thus, the elements that come before Iron (Fe) in the periodic table are Ni and Mn.