Not necessarily. However, when referring to weight, lightest would indicate the lowest weight.
I dont know the exact number but I do know that the lightest car ever is the "Smart".
That would be boron, with an atomic mass of 10.811.
Lithium is the metal with lowest density.
If you mean subatomic particle as in protons neutrons and electrons, electrons have the lowest mass. If you are talking even smaller, leptons have extremely tiny rest masses.
Helium is the second lightest element. Helium has the lowest boiling point among all the elements. It is chemically inert.
the lightest elements are gases and the lightest of these are hydrogen and helium.
I don't
The lightest element in the group 2 of the periodic table of elements is calcium - with a density of 1,55 g/cm3.
The lightest house is the lighthouse.
The lightest metal is lithium.
The superlative form of the adjective 'light' is lightest.
Hydrogen is the lightest element. The isotope protium is the lightest kind of hydrogen atom.