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Why does sodium impart yellow colour in ...

Why does sodium impart yellow colour in the flame?

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The ionisation enthalpy of Na is relatively low. Therefore when this metal or its salt is heated in Bunsen flame, its valence shell electron is excited to higher energy levels by absorption of energy. When the excited electron returns to its initial position in the ground state, it liberates energy in the form of light in the yellow region of the electromagnetic spectrum. That.s why sodium imparts yellow colour to the flame.
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