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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NTA Abhyas 2020 · Chemistry · Classification of Elements and Periodicity in Properties

Which among the following elements have lowest value of IE _ 1 ?

Which among the following elements have lowest value of IE1?{\text{IE}}_{\text{1}} \text{?}

Options

  1. APb
  2. BSn
  3. CSi
  4. DC

Correct answer

B. Sn

Step-by-step solution

Ionisation energy of carbon group follows the order C>Si>Ge>Pb>Sn.\text{C}\text{>}\text{Si}\text{>}\text{Ge}\text{>}\text{Pb}\text{>}\text{Sn}\text{.}
IEPb>IESn{\text{IE}}_{\text{Pb}} \text{>}{\text{IE}}_{\text{Sn}} because of poor shielding effect of electrons resulting in lanthanide contraction.
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