the existence of unpaired electrons in the valence shell. :)
the number of electrons in the outermost shell
It arises from lateral vestibular nuclei in the pons
The electrons determine the reactivity. How many valence electrons there are. It is easier to lose one electron rather than three, so an element with one valence electron will be more reactive than one with three.
its Atomic Mass.
It’s the most massive part of the atom
Robert Koch
It's determine by the vacancy (unfilled orbital) in the outermost shell of an atom.
Reactivity refers to how vigorously an atom is to react with other substances.
Electron Configuration
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Outer, or valence, shell electrons do.
The reactivity of an atom is due to its number and arrangement of __________ in the outer energy level (or orbit). your question was confusing but I was able to interperet it. the answer is Electrons
Boron (atomic number 5) is more reactive than neon (atomic number 10).
true
Describe the reactivity of halogens
For metals high electronegativity mean low reactivity; for halogens, C, O, N, S, etc. the meaning is high reactivity.