(a) what are allotropes? (b) give two crystalline allotropes of carbon. (i) (ii) (c) give one property and the use, based on the property, o you have named in (b) above.
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.