Hydrogen is the least dense of all the elements and all other known substances.
hydrogen
Hydrogen
Hydrogen with 0.09 density
Hydrogen has the lowest density of all elements. Density of it is 0.084 gm-3. It is a diatomic gas.
Hydrogen because it is only one proton and one electron.
Helium melting point: -272,2 0C Rhenium boiling point: 5 596 0C
The atom that has the lowest mass is hydrogen. So assuming the same numbers of atoms in each element, hydrogen would be the element with the lowest mass.
Hydrogen: 0,089 88 g/L at 0 0C and 101,325 kPa.
hydrogen
Helium is the second lightest element. Helium has the lowest boiling point among all the elements. It is chemically inert.
The element which has been measured to have the lowest density is hydrogen. Not only is hydrogen the least dense element, it is also the most plentiful on earth.
All elements have a specific signature, whereby one element is exactly different from another element.