The electron transport chain between photosystem II and photosystem I generate a proton gradient which drives ATP synthase known as

Complex V

Explanation:

In the mitochondria of normal cells, the ATP synthase, also referred to as Complex V of the electron transport chain, synthesizes ATP from ADP and phosphate by using a proton gradient. The electrons transferred by the complexes I, III, and IV extrude protons to the intermembrane region, thereby generating a proton electrochemical gradient that is used by this Complex (V) when protons pass back across the inner membrane to the matrix space. The complex V is composed of two major functional domains named F0 and F1.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt