Which properties describe elements that are nonmetal gases? Select all that apply. A) composed of an extended structure
B) composed of individual atoms or diatomic molecules
C) high melting point
D) low melting point
E) strong attractions between particles
DF)
weak attractions between particles

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

How have the greenhouse gasses increased from the year 2000 to 2018

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.