Question

Give a one-word answer.

Classification in which the first and eight-element are similar.

Answer 1

Newland's law of Octaves:

• At the time of British chemist John Newlands, 62 elements were known.
• He arranged them in an ascending order based on their increasing atomic masses and observed that every 8th element had similar properties as that of the first one.
• Newlands compared the similarity between the elements to the octaves of music, where every eighth note is comparable to the first.

For example, the properties of sodium and potassium are similar, because Potassium is the Eighth element, starting from sodium.