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Because they were not discovered and were unknown when Newlands proposed his periodic table

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Why was neon and helium missing from Newlands periodic table?

Neon and helium were missing from Newlands' periodic table because they are noble gases and were not well understood at the time. These gases are chemically inert and do not readily form compounds with other elements, making them distinct and not fitting into the periodic trends that Newlands was trying to establish.


What was wrong with newlands periodic table?

it wasn't a real table


Which group is missing from john newlands periodic tabale?

The noble gases group is missing from John Newlands' periodic table. The noble gases were not discovered until after Newlands proposed his periodic table in 1864.


Why was Newland's periodic table rejected?

The table of Newlands was only an incomplete precursor of the Mendeleev table.


Why was Newlands and periodic table rejected?

Newlands' periodic table was rejected because it had gaps and did not account for newly discovered elements. The periodic table was improved by Mendeleev's table, which arranged elements in order of increasing atomic weight and left gaps for undiscovered elements. This allowed for a more accurate prediction of the properties of missing elements.


What is the abbreviation for helium on the periodic table?

The abbreviation for helium on the periodic table is He.


How many elements had they discovered in 1865 when Newlands was developing the Periodic Table?

62


What is the number of helium in the periodic table?

the number of helium in the periodic table is 2.


What is the atomic sign for helium on the periodic table?

The atomic symbol for helium on the periodic table is He.


Does h stand for helium on the periodic table?

No, the symbol "H" stands for Hydrogen on the periodic table. The symbol "He" stands for Helium on the periodic table.


Is natrium chloride table salt or helium?

helium


What period is helium in in the periodic table?

Helium is in the first period of the periodic table.