Question

Valency of phosphorus is 3. What is the formula of its oxide, sulphide and chloride ​

Answer 1

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Answer 2

THE FORMULA OF PHOSPHOROUS OXIDE, PHOSPHOROUS SULPHIDE, AND PHOSPHOROUS CHLORIDE ARE $P_{2}O_{3} , P_{2}S_{3} ,PCl_{3}$ , RESPECTIVELY.

Explanation:

• The valence electrons of an atom is the number of electrons present in the outer most / valence shell.
• Whereas the valency is the number of electrons required to gain or lose to complete the octet.
• Phosphorous has an atomic number of - 15. Its electronic configuration is 2, 8, 3.
• The valency of oxygen is 2, the valency of sulphide is 2, and that of chloride is 1.
• The formulas can be written by criss-cross method as shown in figure:

       $P_{2}O_{3} , P_{2}S_{3} ,PCl_{3}$