Francium is the least electronegative element
Flourine
Beryllium is the alkaline earth element with the least massive atoms.
Nitrogen is the least abundant element in the atmosphere of the Earth. The most abundant element in the atmosphere of the Earth is oxygen.
XENON
No.
This chemical element is wolfram (W).
This chemical element is wolfram (W).
Helium is the least dense element at normal conditions.
Hydrogen.
Aerogels - but this is an artificial compound. Among naturally occurring metals, Lithium (Li).
The element with the least mass in Period 2 is Lithium (Li). It has an atomic mass of approximately 6.94 g/mol
Plutonium is a very toxic element; also is a radioactive element.