Which of these elements have the strongest and the weakest forces between its atoms. Give A Reason For Your Answer. Copper, oxygen, carbon, helium, sulphur and magnesium.

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Describe the forces both attractive and repulsive that occur as two atoms move closer together.