[Answer] Which of the following elements is NOT represented by a single letter on the periodic table?

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Which of the following elements is NOT represented by a single letter on the periodic table?

• Aluminum : ...An extended theorizes about beyond oganesson ( beyond period 7, The table below shows possibility for the appearance of the eighth period, . all models show the higher the pattern established by lighter . "Resource QEDV-1: The QED vacuum".

• Aluminum : Every element in the Periodic Table has been given a unique 1, 2 or 3 letter symbol. The first letter of an element symbol is always a capital letter. Many of the element symbols are quickly remembered with just one letter. These elements are: B for Boron, C for Carbon, F for Fluorine, H for Hydrogen, I for Iodine, K for Potassium, N for Nitrogen, O for Oxygen, P for Phosphorus, S for Sulfur, U for Uranium, V for Vanadium, W for Tungsten, and Y for Yttrium. Any subsequent letters, which make up the element symbols, are expressed in lower case, for example the chemical symbol for Aluminum is “Al”....As of August 2017, 118 chemical are identified. A chemical or is a species of atoms having the same number of protons in their 

• Aluminum : ...A chemical is a species of atoms having the same number of protons in their atomic . If an has isotopes that are radioactive, are termed "stable" isotopes. . The version of this classification used in the here .. The "Q" is reserved for "heat" in a chemical reaction.

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• The is a tabular arrangement of the chemical , ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows . Generally, within row (period) the are metals to the left, and -metals to .. Each chemical has a unique atomic number (Z) the 
• In relation to the chemical , a symbol is a code for a chemical . Many functional groups have their own chemical symbol, e.g. Ph for the phenyl group, and Me for the methyl group. Chemical symbols for normally consist of or two from details can be omitted if relevant in a certain context.

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