Final answer:
The energy required for an electron to move up to the next higher energy level is known as an energy quantum, which is a quantized value due to the discrete nature of electron energy levels in an atom.
Step-by-step explanation:
The amount of energy required to move an electron from its present energy level to the next higher one is known as an energy quantum. According to Bohr's model, when an electron jumps from one energy level to another with a higher energy, there is a fixed and definite energy change associated with it. This energy change is required to overcome what can be considered an energy barrier.
When energy is added to an electron, it can be excited to a higher energy level. This energy is quantized, meaning that an electron can only occupy certain energy levels, characterized by the principal quantum number, often symbolized as n. The energy levels are not continuous but are distinct states an electron can occupy within an atom.