Understanding Newland’s Law of Octaves

Newland’s periodic classification, also known as the Law of Octaves, was an early attempt to arrange elements based on their properties. J.A.R. Newland noticed that when elements were listed in increasing order of their atomic weights, the properties of the eighth element were similar to those of the first element, just like the notes in a musical scale (Do, Re, Mi, Fa, Sol, La, Ti, Do).

He arranged the known elements in horizontal rows of seven, such that elements in the same vertical column had similar properties. The first element in each row started a new "octave".

Arrangement of Elements in Newland’s Classification

Let's look at how Newland arranged the first few elements:

The numbers in parentheses indicate the position of the element in Newland’s sequential arrangement based on increasing atomic weight.

Identifying the Tenth Element in Newland’s System

Based on the arrangement in the table:

• The first element is Hydrogen (H).
• The second element is Lithium (Li).
• The third element is Beryllium (Be).
• ...
• The eighth element is Fluorine (F).
• The ninth element is Sodium (Na).
• The tenth element is Magnesium (Mg).

Applying the Law of Octaves to Find Resemblance

Newland’s Law of Octaves states that the properties of every eighth element are similar to those of the first element. Following this pattern:

• The 8th element (F) resembles the 1st element (H).
• The 9th element (Na) resembles the 2nd element (Li).
• The 10th element (Mg) resembles the 3rd element (Be).
• The 11th element (Al) resembles the 4th element (B).
• And so on...

The tenth element, Magnesium (Mg), is the third element in the second octave (counting from F as the first element of the second octave). According to the law, it should resemble the corresponding element in the first octave, which is the third element, Beryllium (Be).

Therefore, the tenth element in Newland’s periodic classification resembles the third element.

Conclusion on Newland’s Periodic Classification

According to Newland's Law of Octaves, the element at position 10 (Magnesium) exhibits properties similar to the element at position 3 (Beryllium).

Revision Table: Newland’s Law of Octaves Summary

Additional Information: Evolution of Periodic Table

Newland’s classification was an important step towards the development of the modern periodic table. It followed Döbereiner’s Law of Triads and preceded Mendeleev’s and Meyer’s more sophisticated periodic tables. While Newland’s law had limitations, the idea of periodicity (repetition of properties) was fundamental and carried forward into later, more successful models.

• Döbereiner’s Triads (c. 1829): Grouped elements into sets of three based on similar properties.
• Newland’s Law of Octaves (1865): Suggested properties repeat every eighth element.
• Mendeleev’s Periodic Table (1869): Arranged elements by atomic weight, leaving gaps, and predicting properties.
• Modern Periodic Law (Moseley, 1913): States properties are periodic functions of atomic number, leading to the modern periodic table arrangement.