Which two elements make up approximately 99% of the Sun's mass?

The Sun is a massive ball of plasma that contains mostly hydrogen and helium. These two elements make up about 99% of the Sun's mass. Hydrogen is the most abundant element, making up around 74% of the Sun's mass, while helium makes up about 24%. The remaining 1% of the Sun's mass is made up of heavier elements, such as carbon, nitrogen, oxygen, and neon, among others.

Hydrogen and helium are also the most abundant elements in the universe, and they are the building blocks of stars. In the Sun, hydrogen atoms combine to form helium in a process called nuclear fusion, which releases a huge amount of energy. This energy is what powers the Sun and provides the light and heat that sustains life on Earth.