Which of the reagents would oxidize Cr to Cr2+ , but not Pb to Pb2+?

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n

How many neutrons does an element have if its atomic number is 50 and its mass number is 166