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Q.

Write the Electronic Configuration of Alkali Metals?

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Detailed Solution

The electronic configuration of alkali metals ends with ns¹, where ‘n’ represents the period number.

Alkali metals belong to Group 1 of the periodic table. They have one electron in their outermost shell, making them highly reactive and ready to lose that single electron to form positive ions (M⁺).

Electronic Configuration Table

ElementSymbolAtomic NumberElectronic Configuration
LithiumLi31s² 2s¹
SodiumNa111s² 2s² 2p⁶ 3s¹
PotassiumK191s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
RubidiumRb37[Kr] 5s¹
CesiumCs55[Xe] 6s¹
FranciumFr87[Rn] 7s¹
  • All alkali metals have one valence electron.
  • They readily form +1 ions.
  • Reactivity increases down the group due to lower ionization energy.

Hence, the general configuration for alkali metals is [noble gas] ns¹.

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