The elements in your periodic table are arranged very carefully that with one look you can readily tell whether an element is a metal, non-metal and metaloid. A stair step line separates metals and non-metals. The majority of the elements on the left side of the table are metals. Metal are shiny, solid, except for the liquid mercury and a good conductor of heat and electricity. Showing the metallic plaster is malleable in backtale. It can be bent or drawn into sheets or wire without breaking and almost about 85% of the elements are metals. Even though metals are great in number in the periodic table, it does not mean that they are more abundant because in the Earth's crust oxygen is the most lentifool element and in the universe. Hydrogen is the most abundant. The non-metals are confined to the right side of the table. Generally, non-metal is a poor conductor. It usually shows no metallic plaster, brittle and non-ductile in the solid state. Semimetals or metal loids have the appearance in some properties of metal but behave like a non-metal in certain instances. The seven elements commonly regarded as semimetals are 1-boron, 2-silicon, 3-jermanyu, 4- arsenic, 5-antimony, 6-thilarium and 7-pulanyu. Boron, although not resembling a metal in appearance, is included because it resembles silicon, silicon, germanium and antimony are a arsenic conductors which are important in solid state electronic. Semic conductors are insulators at lower temperatures but become conductors at higher temperatures. Metallic property relates to how easy it is for an atom to lose an electron. With respect to the position in the periodic table of the representative elements, the metallic character increases from top to bottom and decreases from left to right. While the non-metallic character decreases from top to bottom and increases from left to right as seen in the figure below, the reactivity of metals tends to decrease from left to right across the periodic table and increases from top to bottom in a family or group. Using your periodic table, you will be able to determine the metallic character of elements. Which one is more metallic? Is it silver or tea? It is silver because when you look at the periodic table, they are on the period that moves to the right. So it means that when we move to the right, then the metallic character of the elements decreases just like in silver and tin. Electron configuration is a simple way of writing down the locations of all of the electrons in an atom. It is the arrangement of electrons within an atom. The electron configuration describes where the electrons are inside orbitals. They are the summary of where the electrons are around the nucleus. The structure of the periodic table of elements is partly based on electron configuration. It tells us how these electrons are distributed among the various atomic orbitals. As you can see in the figure above, we have four kinds of electrons configuration to the different parts of the periodic table. Each part has corresponding orbitals that will represent the end of their electron configuration. These are SPDF orbitals. An atom can have more than one orbital. In fact, all except hydrogen, too. Similarly, atoms can have more than one of each kind of orbital. It describes electrons as each moving independently in an orbital, in an average field created by all other orbitals. Try to remember these terms. One, electronic configuration. The way the electrons of an atom are distributed in the various energy levels or electron shells. Two, electron shells are also called energy levels. A model of an electronic structure that presents a picture where electrons occupied regions are around the nucleus. Three, violent shell. The highest energy level that an electron occupies in the outer most shell. Based from the chart of electron configuration, chlorine has 17 atomic numbers. And the electron configuration are 1s2, 2s2, 2p6, 3s2, 3p5. So, the number of the electron in the orbital is equal to the atomic number of chlorine. Where the highest energy level is 3 and the valence electron configuration are 3s2, 3p5. The electron configuration of the element sodium is 1s2, 2s2, 2p6, 3s1. The highest energy level is 3, types of orbital, s and p, and the electrons in the valence shell is 1. Always remember that s orbital can hold up to 2, p orbital holds up to 6, d orbital holds up to 10. F orbital holds up to 14 numbers of electron in the orbital. By simply writing the electron configuration of an element and knowing its highest energy level, we can determine the period number of a particular element.