Periodic Table

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Periodic Table


Dmitri Mendeleev February 8th,1834 – February 2nd,1907

The periodic table was invented in 1869 and the creation was credited to Dmitri Mendeleev

The Periodic Table Consists of 118 elements with 4 of those yet to be confirmed. The table is made up of 7 periods (rows) and 18 groups (columns). The discovery and creation of the table is mainly credited to Dmitri Mendeleev. The names of the groups in the table are Lanthanides, Actinides, Alkali Metals, Alkaline-earth Metals, Transition Metals, Main Group Elements, Halogens, Noble Gases, and other Non-Metals. The order of the table goes by the atomic number of the element and the elements are classified as metals, non metals, or inert gases. Elements are named after a mineral, place, scientist, mythical object, or a country.

Group and Periodic Trend(s)Reactivity: (Period)The atomic size and Ionic size increase. The Ionization energy and electronegativity decreases. The nuclear charge and sheilding increase.(Group)The atomic size decreases and the ionization, electronegativity and nuclear charge increases. The sheilding is constant.Metallic character: (Perod) Metallic character decreases as you move right across the periodic table. (Group) Metallic character increases as you move down the group in a periodic table.Atomic radii: (Period) The trend to smaller atoms across a period in which it is caused by the increasing positive charge in the nucleus(Group) The main group elements increase down a graph.Ionization energy: (Period) The main group elements increase across each period.(Group) Ionziation energies decrease down the groups.Electron Affinity: (Period) As electrons add to the same p sublevel of atoms with increasing nuclear charge, electron affinities become more negative across each period with the p block.(Group) Electrons add greaty difficulty down a group.Ionic Affinity: (Period) The metals on the left side of the periodic table tend to form cations and the non metals at the upperright of the periodic table form anions. (Group) As there is an incrase of atomic radii down a group, there is an increase of Ionic Radii.Electronegativity: (Period) Electronegativities increase across each period. (Group) electronegativities either decrease down a group or remain the same.

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