Correct Answer: Calcium (Ca)
Subject: chemistry
Explanation: • <b>Key Fact</b> The Law of Octaves was applicable only up to calcium. • <b>Supporting Detail</b> After calcium, every eighth element did not possess properties similar to the first. • <b>Related Concept</b> It worked well only for lighter elements. • <b>Why wrong options are wrong</b> Options A, C, and D fall outside the specific boundary of this law's validity. • <b>Exam Trick</b> Remember "Newlands stopped at Milk (Calcium)". • <b>Additional Info</b> Newlands assumed only 56 elements existed in nature.
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