Thales mellitus, a Greek scientist, discovered the symptoms electricity obtained by rubbing amber, which in Greek is called electron. After turns amber rubbed it can attract small objects that are nearby. Such properties in electrical science called electrification. Electricity that occurs in the polished amber called static electricity that electricity does not flow.
The whole object or material, which in normal conditions are solid as iron, wood and clothing, or in the form of liquid such as water and oil, or gaseous like air and water vapor is composed of various substances that make up the physical object.
In essence the material consists of a basic substance called the element or elements. There are 110 elements that have been found by experts in the universe. Elements that make up a material made up of atoms. Atom is the smallest particle of an element that can stand alone or be single and may also exist in the form of combination or mixture of various elements. All matter is composed of atoms of the same type or a combination of several atoms, and the entire structure of the atom is electric.
A substance made up of tiny particles called atoms. Atomos atoms derived from the word, which means can not be divided again. But, in development, in fact atom can still be described again. Atom consists of two parts, namely the atomic nucleus and the atomic shell. Positively charged atomic nucleus, while the atomic shell consists of negatively charged particles called electrons. Atomic nucleus is composed of two kinds of particles, which are positively charged protons and uncharged neutrons (neutral).
The nucleus is located in the center of the atom, therefore, often referred to as a nucleus. The nucleus consists of protons and neutrons. Electric charge possessed by protons equal to the charge possessed by electrons but different polarity. Electrons are negatively charged, while the positively charged protons. The number of protons in the nucleus of the element that differentiates with other elements.
An atom consists of:
– The nucleus is called the nucleus. The nucleus consists of two closely related particles, called the positively charged protons and uncharged neutrons.
– Negatively charged electrons, whose movement around the ellipse-shaped nuclei. Electrons are located in the outermost track is called free electrons.