hydrogen is the lightest element
No, hydrogen is ?the lightest element in the periodic table.
Oxygen, Hydrogen and Helium.
Water is made up of hydrogen and oxygen. Hydrogen is the lightest and most abundant chemical element.
Carbon (after hydrogen, helium and oxygen).
Hydrogen is the most common element in the universe as a whole; about 75% of the universe by mass is hydrogen (since hydrogen is also the lightest element, that means that the percentage by number of atoms is even higher) . Helium is second; oxygen is a fairly distant third.
No. Helium does not react with anything and oxygen is an element: you cannot get an element by combining substances. You can, however, split water apart into hydrogen and oxygen.
Hydrogen
Carbon (after hydrogen, helium and oxygen).
Carbon (after hydrogen, helium and oxygen).
The second lightest element on the periodic table is Helium (He). The easiest way to tell this is by the numbers on the periodic table, all elements are in atomic weight order (super-light gases to super-heavy elements).
oxygen (following hydrogen and helium)
The gasses, Carbon, Sulfur, Oxygen, Hydrogen, Helium...