Which of the following was most likely not present in creating the amino acids of early earth's waters of the past?

sulfur

nitrogen

hydrogen

ammonia

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull

Is a pencil falling to the floor anon contact force, a force, or a contact force