The potential energy of two charges interacting is given by Coulomb's Law. This states that energy is related to the charges and the distance between them where
q1 and q2 are the charges of the ions
r is the distance between charges
ε is the dielectric constant which for vacuum (gas phase) is simply equal to one
According to Coulomb's Law, which pair of charged particles has the lowest potential energy?
a. a particle with a 1– charge separated by 150 pm from a particle with a 2+ charge
b. a particle with a 1– charge separated by 150 pm from a particle with a 1+ charge
c. a particle with a 1– charge separated by 100 pm from a particle with a 3+ charge
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