Question

what did newlands \law of octaves\ demonstrate? every third mass had different chemical and physical properties. every third mass had similar chemical and physical properties. every eighth mass had different chemical and physical properties. every eighth mass had similar chemical and physical properties.

Explanation:

Newlands' Law of Octaves stated that when elements were arranged in order of increasing atomic mass, every eighth element had similar chemical and physical properties, similar to musical octaves.

Answer:

Every eighth mass had similar chemical and physical properties.