Question
Download Solution PDFWhich of the following elements was the last element in Newland's Law of Octaves?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Thorium.
Key Points
- Newland's law of octave states that when elements are arranged in the increasing order of their atomic masses in the periodic table, the properties of the eighth element are a repetition of the first element.
- John Newlands, an English scientist first arranged this starting with Hydrogen and ending with Thorium (atomic number = 56). Hence option 2 is correct.
- This law was discovered when none of the inert gases was known.
- So if we take the elements from Lithium (Li, Z =3) and Sodium (Na, Z = 11), Sodium possesses similar properties to Lithium.
Additional Information
- Though this law does not apply to the whole table, it is till Calcium only and after that eighth element did not have the properties of the first element.
- When arranged in the increasing order of their atomic weights, Newland's law of octaves worked mostly with lighter elements.
- Thorium (Z = 90) is a radioactive metal and is used for ceramics, telescopic and camera lenses, heat-resistant paints, sources of nuclear power etc.
- It is also used in radiometric dating and strengthening magnesium.
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