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NTA Abhyas NEET2020ChemistryClassification of Elements and Periodicity in PropertiesPractice

Which of the following is the wrong statement?

Options

  1. AAll the actinoid elements are radioactive
  2. BAlkali and alkaline earth metals are s -block elements
  3. CChalcogens and halogens are p -block elements
  4. DThe first member of the lanthanoid series is lanthanum

Correct answer

D. The first member of the lanthanoid series is lanthanum

Step-by-step solution

Lanthanoids are 58 Ce - 71 Lu ( 14 elements ). Electronic configuration of 57 La = Xe 6s 2 5d 1 and is a d-block element.

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