Answer:
atom is the smallest unit of matter that has the characteristic properties of a chemical element.
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- No of protons=No of electrons=15
<h3>Mass no:-No of neutrons+No of protons </h3>

Now
- It has atomic no 15 hence its Phosphorus(P)
Electronic configuration:-
.
Chloride formula:-

or.

Obsidian - extrusive igneous
granite - clastic sedimentary
conglomerate - intrusive igneous
evaporite - chemical sedimentary
coal - organic sedimentary
marble - metamorphic