The Noble Gases
Generally, the least reactive elements are the noble gases.
The least abundant elements in the Earth's crust are typically the rare earth elements such as thulium, lutetium, and hafnium. In the universe, elements such as francium and astatine are considered very rare.
There is at least 117 different elements, and more are still to be discovered.
Helium has the least number of neutrons among the elements listed.
popium
Group 3, the transition elements.
A compound must have at least two atoms of different elements.
It is believed that the air elements (Aquarius, Gemini, Libra) are believed to be the least attached of all the elements. However, that does not mean that they are not affectionate.
The metals in the lower left corner of the periodic table are the least electronegative.
Nobel gases.
magnesium (Mg)
What ARE the 3 least dense elements on the periodic table. Science doesn't matter. Language Arts does. :) Hope this helped