During metabolism, the complete breakdown of one molecule of glucose results in a maximum yield of 38 molecules of

ATP

Explanation:

In break down of one molecule of glucose, the number of energy molecules gained at different level are as follows-

a) Glycolysis - 2 ATP are gained

b) Citric acid cycle-  2 ATP are gained

c) Electron transport chain- 34 ATP are gained (inclusive of conversion of NADH and FADH2 in  terms of ATP , where on NADH is equal to 2 ATP molecule and one FADH2 is equal to one ATP molecule.)

Thus, total number of ATP gained from one cycle of break down of glucose

ATP

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds