Mendeleev

Definition

Mendeleev was a Russian chemist who created the first version of the periodic table. He arranged elements by increasing atomic mass and predicted the existence and properties of undiscovered elements.

5 Must Know Facts For Your Next Test

1. Mendeleev's periodic table organized elements based on their atomic mass.
2. Mendeleev left gaps in his periodic table for elements that had not yet been discovered.
3. He predicted the properties of these missing elements with remarkable accuracy.
4. The modern periodic table is arranged by atomic number, but Mendeleev's work laid the foundation for this organization.
5. Mendeleev's periodic law states that the properties of elements are a periodic function of their atomic masses.

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Related terms

Periodic Table:

A tabular arrangement of chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties.

Atomic Mass:

The mass of an atom, typically expressed in unified atomic mass units (u).

Periodic Law: The principle that the properties of the elements recur periodically when the elements are arranged in increasing order by their atomic numbers.