Answer:
Explanation:
atomic mass
In 1869, Mendeleev published the first periodic table of the elements. In his periodic table, Mendeleev arranged elements in rows by increasing atomic mass. Within a row, elements with lower atomic masses were on the left. Mendeleev started a new row every time the chemical properties of the elements repeated.
Well we need to see the fossil
Answer:
the abbreviation form of full name is called symbol.
the smallest unit of cimpound is called molecule.
Oxygen carbon and hydrogen
