Magnesium is a highly flammable element which is easily combustible in the presence of oxygen: 2mg + o2 --> ? ? + heat how many atoms would you expect to find on the product side of this equation?

What is the chemical formula of the following compound

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.

Who discovered a pattern to the elements in 1869?