How many valence electrons are in an atom of phosphorus?
a. 2
c. 4
b. 3
d. 5 select the best answer from the choices provided a b c d

How many valence electrons are in an atom of phosphorus?

a. 2
c. 4
b. 3
d. 5 Please select the best answer from the choices provided A B C D

There are five valence electrons are in an atom of phosphorus. The answer is letter D. 

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)