Answers

2015-01-04T15:31:49+05:30
If Z= 15,
Then valency will be 3 and the name of the element is phosphorus

2 4 2
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2015-01-04T15:39:57+05:30
Z= 15 (Z is the symbolic representation for Atomic mass)
Therefore the element is Phosphorus and its valency is 3,5
2 5 2