Final answer:
Newton's corrections are needed in helium and hydrogen due to quantum effects that deviate from classical physics predictions.
Step-by-step explanation:
The corrections that are needed in helium and hydrogen are due to the presence of quantum effects. Newton's laws of motion, which are based on classical physics, do not accurately describe the behavior of atoms and molecules at the quantum level.
At the quantum level, particles like electrons and protons exhibit wave-particle duality, meaning they can behave like both particles and waves. This wave-particle duality and other quantum effects result in deviations from classical physics predictions.
So, in order to accurately describe the behavior of helium and hydrogen atoms, we need to use quantum mechanics, which takes into account these quantum effects and provides more accurate predictions.