Which experiment led to the idea that atoms contained a nucleus?

Why are people not able to scuba dive in the deep part of the ocean

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

‘which reaction would most likely require the use of an inert electrode?