HTML elements are categorized as tags. Open end tags and close ended tags are the major classification categories.
9
...as a solid.
Carbon and hydrogen, CH4
Noble gases
Americium, Francium, Polonium
He helped with the periodic table of elemnts.
Carbon dioxide contain carbon and oxygen.
science happens
There are two elements in CO2, carbon and oxygen.
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.