Given below are two statements:

Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number.

Statement (II): Meyer observed a periodical

Question

Given below are two statements:

Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number.

Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers.

(a) Statement I is false but Statement II is true
(b) Both Statement I and Statement II are true
(c) Statement I is true but Statement II is false
(d) Both Statement I and Statement II are false

Canvas Classes · Accepted Answer

Statement I — Newlands' Law of Octaves:

Newlands arranged elements in increasing order of atomic weight (not atomic number). The concept of atomic number was introduced by Moseley much later.

→ Statement I is FALSE.

Statement II — Lothar Meyer:

Lothar Meyer plotted physical properties (atomic volume, etc.) against atomic weight (not atomic number).

→ Statement II is FALSE.

Answer: (d) Both statements are false

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