Question

Metals are arranged in the electrochemical series based on the ease with which atoms of metals __ (lose/gain) electrons to form positively charged ions.

Answer 1

Metal elements lose electrons from the outermost shell of their atoms, forming positive metallic ions.

$K\to K^{+}+e^{-}$

However, the tendency to lose these valence electrons varies from metal to metal. Consequently, the metallic elements can be arranged in decreasing order of their tendency to lose electrons.

Based on the ease with which atoms of metals lose electrons to form positively charged ions, the metals are arranged in a series known as the electrochemical series.