Lithium has a lower electronegativity than krypton. The electronegativity for lithium is 0.98; the electronegativity for krypton is 3.0.
Note that most noble gases in group 18 have no electronegativity at all since the do not make compounds. However, since krypton and xenon do make compounds under some circumstances, they do have a measurable electronegativity.
In any row of the periodic table, the group 8 element - the noble gas - is the least reactive. The known group 8 elements are Helium, Neon, Argon, Krypton, Xenon and Radon
Most likely lithium since it has a the highest ionization energy than the others.
the least reactive METAL is lithium!!
The lightest element that is in period number 2 is lithium. Lithium is also the solid that is the least dense.
Kr= krypton hope that helps you guys out who aren't as smart as some others with this type of science elements periodic table, I'm not the smartest person in science but at least i knew this really easy answer :P what the hello dude that's not it /!!?!
Lithium.
Lithium, Nickel, Xenon.
rubidium
These elements are hafnium and zirconium.
Noble gasses are least reactive of all the elements. So the least reactive element in the period 4 is Krypton. It is a noble gas with an atomic number of 36.
The electronegativity from least to highest : Ba, Be, Bi, B, Br The electronegativity of an element is a measurement of how its atoms attract electrons. This is based on the atomic weight (width of the atomic nucleus) and the distance of its valence electrons from the nucleus. As displayed on the Periodic Table, elements generally increase in electronegativity as you move across (left to right), and decrease as you go down the table. (Only aluminum does not follow this in this set of elements.) (see related link)
Lithium, (Li) element three and the least reactive of the alkali metals group.
The periodic table goes from left to right if your looking for re-activity (with the exception of hydrogen). Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium are the most reactive elements. The Noble gases are the least reactive elements which include Argon, Neon, Helium, Krypton, Xenon, Radon, and (arguably) Ununoctium. Hope that helps!
if its for apex learning then the answer is bromine
Lithium
All alkali (not alkaline-earth) metals are extremely reactive with water, but within the group, lithium is the least reactive.
In any row of the periodic table, the group 8 element - the noble gas - is the least reactive. The known group 8 elements are Helium, Neon, Argon, Krypton, Xenon and Radon