The identity of an element is determined by A. the number of neutrons
B. the weight of the nucleus
OC. the number of electrons
D. the number of protons
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Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.