Atomic Number 15
Noun
1.
atomic number 15
- a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms
P
,
phosphorus
chemical element
,
element
- any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
apatite
- a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus
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