What is the valency pf element having atomic number 5 to 15
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15 atomic number in periodic table is phosphorus with valency of +3 and +5
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Boron- 2
Carbon- 2
Nitrogen-2
Oxygen- 2
Flourine- 0
Neon- 0
Sodium- 2
Magnesium- 2
Aluminium- 3
Silicon- 2
Phosphorus- 3 or 5
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