hydrogen
Helium has the lowest electronegativity among all elements.
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.
Oxygen is the element that can combine with almost all other elements.
Steel is not a pure element, as it is an alloy composed primarily of iron with small amounts of carbon and other elements.
Barium
Helium has the lowest electronegativity among all elements.
Hydrogen
Hydrogen with 0.09 density
Hydrogen is the least dense of all the elements and all other known substances.
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.
Helium has the lowest boiling and freezing points of all elements. It boils at -268.9°C and freezes at -272.2°C.
hydrogen
Hydrogen: 0,089 88 g/L at 0 0C and 101,325 kPa.
Helium is the second lightest element. Helium has the lowest boiling point among all the elements. It is chemically inert.