Answer:
B) Iron and Cobalt atoms don't attract since their protons and electrons are balanced, meaning both elements are neutral.
Step-by-step explanation:
Electrons have a charge of -1 and protons have a charge of +1. If an atom has the same amount of electrons as protons, the overall charge of the atom is neutral (no charge)
Hint: Think of 27 and subtract 27 from that.
27 - 27 = 0