Answer:
Because the mass contributed by electrons is dwarfed by the nuclear contribution. There exists three orders of magnitude difference. Electronic mass can be ignored to a first approximation.
Explanation:
http://www.nbchpn.org/pdf/NBCHPN_handbook.pdf
Your answer may be in there
Answer:
the bubonic plague
Explanation:
im sorry if it's wrong k
or maybe it's becoace of the fall of the Renaissance