Aside from atomic weight, he also organized his table to group the elements according to known properties. Organizing each element by atomic weight, he cataloged each of the 56 elements discovered at the time. In the late 1800's, Russian scientist Dmitri Mendeleeva was credited with creating one of the first organized periodic tables. Otherwise, his theory still stands today. Also, nuclear reactions can divide atoms into smaller parts (but nuclear reactions aren't really considered chemical reactions). We now know that elements have different isotopes, which have slightly different weights. Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process a chemical reaction simply changes the way atoms are grouped together.Atoms of one element can combine with atoms of other elements to form chemical compounds a given compound always has the same relative numbers of types of atoms.
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