Alkali and alkaline earth metals impart colours when heated over burner. It is due to
Correct answer: D. Excitation of electrons from low energy levels to higher energy levels.
- A. Smaller electronegativity of alkali metals
- B. Smaller ionic radius of these metal
- C. De-excitation of electrons from higher energy levels to low energy level
- D. Excitation of electrons from low energy levels to higher energy levels.
Explanation
When these metals are heated, the thermal energy excites electrons from lower energy levels to higher energy levels in their atomic orbitals.As the excited electrons fall back to lower energy levels, they release energy in the form of light with specific wavelengths, causing the characteristic colors observed
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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