what is the valency of elements 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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The atomic number of this element is 15, so its electronic configuration will be K L M2, 8, 5. It has 5 electrons in its outermost shell, so it needs 3 more electrons to complete the eight electron, inert gas configuration. Since one atom of this element needs 3 electrons to achieve the inert gas electron configuration, therefore, its valency is 3.
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