Mercury (Hg) and bromine (Br) are the only elements in the periodic table that are liquids at room temperature. They are nonreactive, mono-atomic elements with extremely low boiling points. Radon, helium, xenon, neon, krypton and argon are eight noble gases. The element at period 3, group 16 (called on very old periodic tables group VIA) is sulfur (S). Aluminum is the third most abundant element in the earth's crust. Each of the 13 elements has their own unique physical and chemical properties. The elements are arranged in rows (periods) and the columns (groups). The alkaline earth metals are six chemical elements in group 2 of the periodic table.They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). The elements in Group IIIA (B, Al, Ga, In, and Tl) can be divided into three classes. The atomic number of each element increases by one, reading from left to right. Due to the halogens high reactivity, they tend to exist in nature as compounds and ions. Period A horizontal row in the periodic table. 2. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.. 1.Boron. The Group 6A elements have six valence electrons in their highest-energy orbitals (ns 2 np 4). There is no element in period 3 group 6. 3.Gallium. I think the most mysterious,beautiful and useful elements in our world is Group 3,4,5,6 and 7 elements.And know it is time to meet you up with Group 3 elements. You'll find more specific groups, like transition metals, rare earths, alkali metals, alkaline earth, halogens, and noble gasses. This is only two electrons away from having a full octet of eight electrons, so many of these elements form anions having -2 charges: oxide, O 2-; sulfide, S 2-, selenide, Se 2-, etc. It is just slightly less reactive than the active metals. Block Elements are organised into blocks by the orbital type in which the outer electrons are found. 4 New Elements Are Added To The Periodic Table : The Two-Way With the discoveries now confirmed, "The 7th period of the periodic table of elements is … Boron is the only element in this group that is not a metal. Aluminium. Na is a very reactive element in Period 3, what other elements in Period 2 would be considered reactive? The term "halogen" means "salt-former" and compounds containing halogens are called "salts". Members of a group typically have similar properties and electron configurations in their outer shell. The Periodic Table: Illustration of every element in the order of its atomic number is given in the periodic table. There are multiple ways of grouping the elements, but they are commonly divided into metals, semimetals (metalloids), and nonmetals. 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