I am not quite sure what you mean with "most complex"; the element with the highest atomic number that occurs naturally (though only in trace amounts) seems to be Californium (#98), although elements up to #118 have been created artificially.
The most abundant element where? It is the most abundant element in Earth's crust. The most abundant element on planet Earth, on the other hand, is iron, while the most abundant element in the Universe is hydrogen.
The lightest and most abundant element in the entire Universe is hydrogen. Hydrogen has an atomic mass of nearly one.
The most abundant element in the universe is hydrogen.
The first element in the periodic table is hydrogen. It is the lightest and most abundant element in the universe.
Hydrogen is the most common element in the universe, not oxygen.Oxygen is the most common element on Earth, followed by silicone.
Carbon is the 4th most abundant element in the universe, after hydrogen, helium, and oxygen.
The most common element in the universe is Hydrogen.
The most abundant element where? It is the most abundant element in Earth's crust. The most abundant element on planet Earth, on the other hand, is iron, while the most abundant element in the Universe is hydrogen.
The lightest and most abundant element in the entire Universe is hydrogen. Hydrogen has an atomic mass of nearly one.
The most abundant element in the universe is hydrogen.
Hydrogen is the most abundant element in the universe.
Hydrogen is the most abundant element in the universe.
Hydrogen is the most abundant element in the universe.
The most abundant element in the universe is hydrogen.
Hydrogen (H) is the most abundant element in the universe.
The most abundant element in the universe is hydrogen. It makes up about 74% of normal matter by mass.
The 4th most abundant element in the universe is neon. It is a noble gas that makes up about 0.13% of the universe by mass, following hydrogen, helium, and oxygen. Neon is used in lighting, advertising signs, and cryogenic refrigeration.