What is the wavelength of a light of frequency 7.21 x 1014 Hz? O A. 237 nm
B. 721 nm
C. 416 nm
O D. 628 nm

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

if you're asking what comes out, it's steam.