Given below are two statements :
Statement (I) : The \(4 f\) and \(5 f\) - series of elements are placed separately in the Periodic table to preserve the principle of classification.

Statement (II) : s-block elements can be found in pure form in nature.
In the light of the above statements, choose the most appropriate answer from the options given below :

[JEE Main 2024, 27 Jan (Shift 1)]

Question

Given below are two statements :
Statement (I) : The \(4 f\) and \(5 f\) - series of elements are placed separately in the Periodic table to preserve the principle of classification.

Statement (II) : s-block elements can be found in pure form in nature.
In the light of the above statements, choose the most appropriate answer from the options given below :

[JEE Main 2024, 27 Jan (Shift 1)]

YESPYQ · Accepted Answer

Correct answer: c) Statement I is true but Statement II is false. Lanthanides (4f) and Actinides (5f) are placed separately to keep the periodic table compact and to preserve its periodicity and group structure. Most s-block elements (like Na, K, Ca) are highly reactive and do not occur in pure form in nature. They are usually found as compounds (e.g., NaCl, K₂CO₃). Only a few like beryllium (Be) or magnesium (Mg) may exist in less reactive or near-pure forms, but not commonly.

Given below are two statements : Statement (I) : The \(4 f\) and \(5 f\) - series of elements are placed separately in t…

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