A Chemical Element, simply called as Element is a substance that cannot be decomposed into simpler substances by chemical processes. Example: Hydrogen, Oxygen. Chemical Elements are the fundamental materials of which all matter is composed.
Out of the 118 elements identified, the first 94 occur naturally on Earth with the remaining 24 being synthetic elements. There are 80 elements that have at least one stable isotope. Iron is the most abundant element (by mass) making up Earth, while oxygen is the most common element in the Earth's crust. The lightest chemical elements are hydrogen and helium.
Chemical elements constitute all of the ordinary matter of the universe. The article Chemical Elements presents the list of Chemical Elements identified so far. This article plays an Important role in GA/GK preparation in many competitive exams.

Chemical Elements are a species of atom having the same number of protons in their atomic nuclei. For example, the atomic number of oxygen is 8, so the element oxygen consists of all atoms which have exactly 8 protons.