Nuclear energy, energy is inside what

Nuclear energy is energy in the core of an atom

Atoms themselves are made up of three particles called protons, neutrons, and electrons. An atom has a nucleus (or core) containing protons and neutrons, which is surrounded by electrons.

Explanation:

Brainliest please?

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.