Question

why do alkali metals impart colour to the flame? 1 mark​

Answer 1

Answer:

Explanation:

Because of low ionization energy electron get excited to higher energy level when the electron come back to lower energy level then electron emits radiation in visible region.

Alkali metals have low ionization energy because their size is very large.

Answer 2

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Alkali metals impart characteristic colours to the flame due to low ionisation enthalpy, when an alkali metal or its salt is heated in a flame, the valence electrons are excited to higher energy level.

Explanation

Alkali metals and their salts impart a characteristic colour to the Flame this is because the heat from the flame excites the electron present in the outermost orbital to a high energy level.

When this excited electron reverts back to the ground state, it emits excess energy as radiation that falls in the visible region.

Examples of Alkali Metals!

• Lithium.
• Sodium.
• Potassium.
• Rubidium.
• Cesium.
• Francium.