hydrogen
This element is iron (Fe).
Hydrogen is the main component in most stars, making up about 75% of their mass. This hydrogen undergoes nuclear fusion in the star's core to form helium and release energy in the form of light and heat.
Hydrogen is the main component of most stars, making up about 75% of their mass. This is because hydrogen fusion is the primary nuclear reaction that powers the star's energy output, converting hydrogen into helium in their cores.
A binary star. The main component is a Be-type subgiant.
Aluminum
The surface temperature (of the main component of this binary star) is about 6300 degrees Celsius.
Boron is the main component of borax, which is a naturally occurring mineral compound. It is commonly used in household cleaning products and as a multi-purpose cleaner.
Silicon is the main element found in sand, rocks, and soil. It is commonly found in the form of silicon dioxide, which is the main component of sand and rocks.
Its main component is a single element called Silicon (a Silicon chip) but this will have other elements deposited on it, comprising the circuitry, diodes and transistors.
Methane is the main component of natural gas. Natural gas from the well can consist of various hydrocarbons and contaminants. It is mostly methane but also contains two notable gases: propane (another hydrocarbon) and helium (an element released by radioactive decay).
Main sequence star: hydrogen-1. Red giants: helium-4.
Main sequence star: hydrogen-1. Red giants: helium-4.