Which occurs whenever valence electrons are shared or transferred between atoms? 1. a decrease in charge.2. an increase in charge.3. radioactive decay.4. a chemical reaction.

Whenever electrons are shared or transferred between atoms there is a chemical reaction.

The electrons that are being transferred between atoms (two or more) create new bonds, which enable the production of a new substance. This process is then known as a chemical reaction.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

a corroding iron, if that's one of your choices