The elements Hydrogen (H) and Chlorine (CI) combine together to form HCI (Hydrochloric Acid). Here is the information for each of these elements:

Hydrogen (H): Atomic number: 1; Atomic mass: 1.008
Chlorine (CI): Atomic number: 17; Atomic mass: 35.453

Check all that apply to the bonding of Hydrogen and
Chlorine:

Covalent
Double Bond
Single Bond
lonic
Triple Bond

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

not sure if this what   you'r looking for would be percent composition