Question:

The alkali metal used in photoelectric cell is

Updated On: Jul 7, 2022
  • Na
  • Cs
  • Rb
  • Fr
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The Correct Option is B

Solution and Explanation

This is because of the lowest ionisation enthalpy of Cs because of its largest size, valence electrons can be easily ejected out and thus it is widely used in photoelectric effect.
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Concepts Used:

Anomalous Behaviour of Beryllium

  • Anomalous behavior of an element mentions the deviation of the properties and behavior of an element from its usual or normal behavior.
Anomalous Behaviour of Beryllium
  • Beryllium has a small atomic size as well as ionic size.
  • The high ionization enthalpy and small size of alkaline earth metals reverberate in the formation of covalent compounds that are easy to hydrolyze.
  • Their coordination number is not greater than 4 due to the presence of 4 electrons in the valence shell.
  • Their oxide and hydroxide are amphoteric in nature.