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9
...as a solid.
Noble gases
He helped with the periodic table of elemnts.
Carbon dioxide contain carbon and oxygen.
science happens
The columns organise the elemnts according to the number of valence electrons that give rise to many of the similarities between the chemistry of the elemnts in the column. The rows organise in increasing atomic number.
The elements in a molecule of nitrous oxide are nitrogenand oxygen.
Yes,elements and compounds are pure substance.
His big task was to identify a pattern in the elemnts.
Do you mean symbol? The symbol for copper is Cu. Elemnts don't have formulas.
No, they are in 4th series of transition metals.