helium and hydrogen
The two most common elements in the Universe, and in most stars are - in that order - hydrogen and helium (elements #1 and #2).
-2
These elements are carbon, oxygen, hydrogen.
-2
Elements in group 2 mostly takes the oxidation number +II.
silicon oxygen iron
+2
An angel or star are the 2 most common-the star to represent start of Bethlehem
In the earth crust: silicon, aluminium, oxygen.
the most common element is hydrogen and its molecule of two hydrogen atoms is the most common molecule
Elements listed in the periodic table of elements are neutral; they do not have a charge. When they undergo chemical reactions they may become charged ions. There is no single most common charge for ions, but the most common are -1, -2, -3, +1, +2 and +3.
The two most common elements in Earth's atmosphere are nitrogen, making up about 78%, and oxygen, making up about 21%.