Particle Matter 3

                                Molecule

     You have known that smallest piece of any substance that can't be subdivided is called atom. You also known that atom can be charged. Now, what will be happen to atom if incorporated in certain grup?

   The most elements in the world aren't pure elements, but a unification of other elements, either similiar or not similiar. The unification of some elements establishes either mixtures or compound. The smallest piece of compound is called molecule. The smallest unit of an element is called atom. Molecules are neutral particles consisting of two or more atoms, both similar or different (not similar).molecule can be divided into two, namely monatomic molecules and polyatomic molecules.

Particle Matter 2

                                        Ion

     You have understood that there area charged particle in atom. Some particles types in atom also have different electron is negative and proton is positive, while neutron is neutral. But, atom will obtain or loss electron if incorporated with the other atoms. This cause the atom has positive or negative charged. The charged atom is called ion. So, ion is atom or atom cluster containing electrical charge. Process of ion establishment is called ionization. If an atom loss electron , the atom will be positive. The atom like this called terion atom.

     Generally, compound consist of molecules. For example, sugar compound is composed of sugar molecules. But ,there are compounds composed of ions. A compound composed of ions called ion compound, for example common salt. Common salt if dissolved in water will be subdivided to form ion, namely sodium ion with positive charge (Na⁺) and chloride ion with negative charge (Cl^-). Positive ions called Cation and negative ions called Anion. Cation is usually derives from metal element, for example Silver (Ag⁺) and Copper (Cu²⁺). Anion derived from no-metal element, for example Iodine (I^-) and Sulphur (S^2-).

Particle Matter 1

                                                 Atom

     Atom derives from Greek Atomos that means indivisible. The term atom was proposed by Greek philosopher, Leukippos and Democritus in 4th century BC. At that time there were two opinions about the division of matter, that is the opinion of Democritus and Aristotle.

a. Democritus

"The division of matter is discontinued. That is, if the material is divided and subdivided finally obtained the smallest particles called atoms."

b. Aristoteles

"The division of matter is continuous., Meaning that the division of matter can continue without limit."