How many valence electrons are in the sulfuric nitronium ion NO2^+ ?

9

Explanation:

#Valence electrons = ∑ valence electrons of each element

If working polyioins, add electrons to anions and subtract electrons from cations.

#Valence electrons in NO²⁺ = N + O - 2e⁻ = 5 + 6 - 2 = 9 valence e⁻

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.