The Periodic Table

Part I of Essay
is known as the most important tool in a chemical laboratory.The elements in are classified into groups or families. provides an easy way to show the divission of the elements into acid-forming and base-forming types.It is also a universal table. is filled whith many vi ....

Part II of Essay
.... into acid-forming and base-forming types. Those on the left are base-forming; those on the right are acid-forming. Those in between can be either. They have so-called amphoteric oxides and hydroxides that can act like acids or bases. 's arrangement also divides the elements into metallic and nonmetallic kinds. A distinction is usually made between most pure metals and nonmetals according to physical and chemical properties. Another virtue of is that it is universal. No matter where it is used any scientist can understand it.It is an ....