Periodic Table... A SUMMARY

The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations (electron shell model), and recurring chemical properties. Elements are presented in order of increasing atomic number (the number of protons in the nucleus). The standard form of the table consists of a grid of elements laid out in 18 columns and 7 rows, with a double row of elements below that. The table can also be deconstructed into four rectangular blocks: the s-block to the left, the p-block to the right, the d-block in the middle, and the f-block below that.

The rows of the table are called periods; the columns are called groups, with some of these having names such as halogens or noble gases.

Standard 18-column form of the periodic table

HERE GOES A TABULAR REPRESENTATION OF THE CLASSIFICATION OF THE ELEMENTS IN THE PERIODIC TABLE:

Group number	Type of element	Some examples			Physical properties	Chemical properties
1	Alkali metals	Lithium Sodium Potassium Rubidium Cesium Francium			malleable, ductile, good conductors of heat and electricity, softer than most other metals	very reactive metals, only one electron in their outer shell, explode if they are exposed to water.
2	Alkaline Earth	Beryllium Magnesium Calcium Strontium Barium Radium				have an oxidation number of +2, making them very reactive.
3	Transition metals	Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver	Cadmium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Ununnilium Unununium Ununbium		both ductile and malleable, and conduct electricity and heat. Noteworthy elements are iron, cobalt, nickel- only ones to produce magnetic field	Valence electrons in more than one shell that is why they have several oxidation states
13.14.15	Other metals	Aluminum Gallium Indium Tin Thallium Lead Bismuth			ductile and malleable, solid, have a relatively high density, and are opaque.	do not exhibit variable oxidation states
	Metalloids	Boron Silicon Germanium Arsenic Antimony Tellurium Polonium			Have properties of both metals and non-metals. Some of the metalloids, such as silicon and germanium, are semi-conductors. This means that they can carry an electrical charge under special conditions. This property makes metalloids useful in computers and calculators.
14-16	Non-metals	Hydrogen Carbon Nitrogen Oxygen Phosphorus Sulfur Selenium			not able to conduct electricity or heat, very brittle,neither ductile nor malleable, exist either as gases (such as oxygen) or solids (such as carbon)at room temperature, no metallic luster, and do not reflect light.		have oxidation numbers of ±4, -3, and -2.
17	Halogens	Fluorine Chlorine Bromine Iodine Astatine			The halogens exist, at room temperature, in all three states of matter: Solid- Iodine, Astatine Liquid- Bromine Gas- Fluorine, Chlorine		Compounds containing halogens are called "salts". All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1.
18	Noble gases	Helium Neon Argon Krypton Xenon Radon			Gaseous in nature		oxidation number of 0 prevents the noble gases from forming compounds readily.
3 (6th and 7th period)	Rare Earth Metals	Lanthanide series Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium		Actinide series Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium	The Rare Earth Elements are made up of two series of elements, the Lanthanide and Actinide Series.		One element of the lanthanide series and most of the elements in the actinide series are called trans-uranium, which means synthetic or man-made.