Well, for starters, if it explodes and you become harmed, injured, mamed, disfigured, dead or disintegrated, then you have your answer, just have your pen and notebook ready when you test any element that you think may be reactive, because you JUST MAY not have much time to write that sucker down.
If the element has a full valence shell, such as the noble gases, then it is unreactive. It the element is missing few valence electrons of has few valence electrons, then the element is very reactive, such as the sodium.
Lithium is more reactive.
I would easily say that Fluorine is the most reactive element in the world. Fluorine is the most electronegative of all elements and will react with all elements. It is so reactive that it cannot be found alone in nature.
The heaviest element that is highly radioactive is Ununoctium, which has an atomic number of 118.
It is not true; many metals are very reactive and several nonmetals are nonreactive.
Halogens.
Plutonium is a reactive chemical element.
Chlorine is a highly reactive element
bromine!
rubidium
Chlorine is highly reactive.
Chlorine is a Highly reactive element.
Gold.
Bromine.
Highly reactive because they only have 7 electrons. They need 8 to be a stable element.
A reactive non metal is an element that can gain the electrons or is more electronegative
phosphorous