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Transcript of Periodic Table
Trends The periodic table helps predict some properties of the elements compared to each other.
Atom size decreases as you move from left to right across the table and increases as you move down a column. The periodic table is the most important chemistry reference there is. It arranges all the known elements in an informative array. Elements are arranged left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. Periodic Table Who invented periodic table? Dmitri Mendeleev was the first scientist to create a periodic table of the elements similar to the one we use today.This table showed that when the elements were ordered by increasing atomic weight. People have known about elements like carbon and gold since ancient time.
Each element has a unique number of protons. you can tell the elements apart because they have different properties.
Could there be a way to organize the elements so you could tell at a glance which ones had similar properties? Periods Rows of elements are called periods.
The number of elements in a period increases as you move down the periodic table because there are more sublevels per level as the energy level of the atom increases. Groups Elements in same group have the same number of valence electrons and share similar chemical properties. The Roman numerals listed above each group are the usual number of valence electrons. Periodic Table Energy required to remove an electron from an atom increases as you move from left to right and decreases as you move down a column. Electronegativity The ability to form a chemical bond increases as you move from left to right and decreases as you move down a column. Ionization Alkaline Earth Metals The second column of elements from the left of the periodic table is known as the Group 2 or alkaline earth metals. This group commonly loses the two s orbital electrons found in their outermost energy level. The first column of the periodic table is the group of elements known as the Group 1 or alkali metals. The alkali metals have only one electron in their outermost energy level. Alkali Metals Group 7A is a family of elements known as the halogens. The word "halogen" means "salt-former." The halogens form salts when they react with a metal. All of these elements exist as diatomic molecules in their gaseous state. Halogens The group of elements at the far right of the table (Group 8A) is known commonly as the noble gases.They do not react with other elements because they already have the desired eight total s and p electrons in their outermost (highest) energy level.They are monatomic gases. Noble Gases "Groups :." Interactives . The Periodic Table .
Groups.N.p.,n.d.Web.07 May 2013. <http://www.learner.org/interactives/periodic/groups5.html>. "Periodic Table of the Elements."
Periodic Table.About.com.Chemistry, n.d. Web. 07 May 2013. <http://chemistry.about.com/library/blperiodictable.htm>. Citation Work Citation So,Can you tell us a major difference between the Mendeleev's periodic table and the modern periodic table?
Why is the 8A group in periodic table named Noble gases? Questions....