Answer:
Similarities between nitrogen
and phosphorus:
(i) Both are
typical non - metals.
(ii) Both form
binary compounds with metal.
. Dissimilarities:
(i) Nitrogen show
maximum covalency of 4 but phosphorous exhibit covalency of 5 and 6 also.
(ii) Except 
all the trihalides of nitrogen are
unstable but phosphorous trihalides are stable.
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