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Lothar Meyer's Periodic Table

Lothar Meyer's periodic table was a raw version of the periodic table. He successfully classified the elements according their valency with the increasing order of atomic weights. He also depicted the periodicity from his atomic volume vs atomic weight graph.

4 min read

Newlands' Law of Octaves

Newlands' Law of Octaves proposed by John Newlands explains the periodic repetition of physical and chemical properties. The law has many limitations, which are discussed in this article.

3 min read

De Chancourtois's Helical Periodic Table

De Chancourtois's helical periodic table was the first periodic table that introduced the notion of the periodicity of elements.

3 min read

Dobereiner's Triads

Dobereiner's Triads or the law of triads divides elements showing similar properties into groups of three.

2 min read

Hund's Rule of Maximum Multiplicity

The Hund rule of maximum multiplicity states the electrons fills the degenerate orbitals singly before getting paired.

6 min read

Honorable Robert Boyle (1627–1691)

Robert Boyle was a chemist of the 17th century and a founder of the modern chemistry.

8 min read

Pauli Exclusion Principle

Pauli Exclusion Principle: An orbital cannot take more than two electrons.

4 min read

Aufbau Principle

The aufbau principle provides a helpful rule in the ordering of atomic orbitals.

8 min read

Energy of Atomic Orbital

The energy of the atomic orbital is decided by the size and shape of the orbital

8 min read

Atomic Orbital

Atomic orbitals are building blocks of the modern quantum mechanics model.

14 min read

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