1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the following statements: I. s-block elements are found pure in nature. II. d-block elements form coloured ions, exhibit, variable valence and paramagnetism. III. Lanthanoids contains the elements from Ce(Z=58) to Lu(Z=71) IV. Actinoids contains the elements from Th(Z=90) to Lr(Z=103). Choose the option with all the correct statements :

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Q. Consider the following statements :
I. $s$-block elements are found pure in nature.
II. $d$-block elements form coloured ions, exhibit, variable valence and paramagnetism.
III. Lanthanoids contains the elements from
$Ce(Z=58) $ to $Lu(Z=71)$
IV. Actinoids contains the elements from $Th(Z=90)$ to $Lr(Z=103)$.
Choose the option with all the correct statements :

Classification of Elements and Periodicity in Properties

Solution:

Statements II, III and IV are correct, while the statement I is incorrect.
It's correct form is as follows :
$s$-block elements are never found in pure nature because of their high reactivity.