The chemiosmotic gradient is an electrochemical gradient across the
membrane of the chloroplast and
the inner membrane of the mitochondrion.

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

a symbiotic relationship with the mitochondria

the tricuspid valve is present between right atrium and right ventricle