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AP EAMCET2012ChemistryClassification of Elements and Periodicity in Properties

In photoelectric effect, if the energy required to overcome the attractive forces on the electron, (work functions) of Li , Na and Rb are 2.41 eV , 2.30 eV and 2.09 eV respectively, the work function of ' K ' could approximately be in eV

Options

  1. A2.52
  2. B2.20
  3. C2.35
  4. D2.01

Correct answer

B. 2.20

Step-by-step solution

As the size of atom (element) increases, energy required to overcome the attractive force on outermost electron decreases. Li , Na , K and Rb are the members of same group and have the following order of size Li 2.09 or the energy for K is 2.20 eV .

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