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What is the valency of magnesium with atomic number 12 and sulphur with atomic number 16? |
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Answer» Solution :(i) ATOMIC number of magnesium = 12 Electronic configuration is 2, 8, 2. A magnesium atom can lose its 2 valence electrons to achieve the inert gas electronic configuration of neon (2,8). Therefore, VALENCY of magnesium = 2. (ii) The atomic number of sulphur = 16. Electronic configuration = 2, 8, 6. A sulphur atom cannot lose 6 electrons to achieve inert gas electronic configuration due to ENERGY consideration. It can gain 2 electrons to achieve the nearest inert gas electronic configuration of argon (2, 8, 8). Thus, the valency of sulphur = 2. |
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