This is false. Aether (or "ether") was a hypothetical substance proposed in ancient and medieval philosophy and alchemy to explain the nature of the cosmos, but it was **never part of the periodic table of elements**. The periodic table, as we know it, was developed in the 19th century by Dmitri Mendeleev, and it only included empirically observed and chemically verified elements. Aether was not one of them. The idea of aether as a physical medium for light waves was debated in 19th-century physics, but it was disproven by the Michelson-Morley experiment in 1887 and later rendered obsolete by Einstein's theory of relativity. It was never "removed" from the periodic table—it was never there in the first place. If you want to verify this yourself, check the historical development of the periodic table on the International Union of Pure and Applied Chemistry (IUPAC) website or review the original publications of Mendeleev and other chemists. The periodic table has always been based on observable, testable elements. Sources:

IUPAC | International Union of Pure and Applied Chemistry

Periodic Table of Elements - IUPAC | International Union of Pure and Applied Chemistry

View the latest release of the Periodic Table (dated 8 Jan 2016) includes the recently added elements 113, 115, 117, and 118 with their temporary n...

Encyclopedia Britannica

Periodic table | Definition, Elements, Names, Symbols, Groups, Charges, & Facts | Britannica

Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number. When the elements are thus a...

https://www.scientificamerican.com/article/bring-science-to-life/ Confidence Level: 100% Verdict: False Warning: This tool is still in beta and may produce inaccurate results. Please always verify the information from reliable sources.