The Periodic Table.

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Presentation transcript:

The Periodic Table

Elements in the Periodic Table Groups Periods

Introduction to Terminologies Groups Periods Periodic table: It is the tabular display of chemical elements. Group: A group or a family is a vertical column in the periodic table Period : The horizontal row in a periodic table is called a period.

Details in the Periodic Table Atomic Number (Z) = number of electrons = number of protons Atomic Mass (A) = number of (protons + neutrons) Also called Atomic Weight.

Reading the Periodic Table

Groups 18 groups in standard periodic table, numbered from 1 to 18 Elements in a group have similar configurations of the outermost shells, leading to similar properties.

Group Names Group 1: Alkali metals Group 2: Alkaline earth metals Group 3-11 : Transition Metals Group 17: Halogens Group 18: Noble gases

Periods There are 7 periods in the table. Elements of the same period have the same number of electron shells. Within each group across a period, the number of electrons and protons increases, leading to increase in atomic number. Elements within the same period do not generally show similarity in properties, except d-block and f-block (lanthanides) elements.

Trends in the Periodic Table Trends occur due to the electronic configurations of elements.

Periodic Trends - Summary

Classification of Elements in Periodic Table Classification depends on the difference in physical and chemical properties of elements: Metals (yellow ) Nonmetals (green) Metalloids (purple)

Properties of Metals Shiny solids at room temperature, except mercury. Good conductor of both heat and electricity. High melting point and density. Shiny and lustrous. Ductile and malleable. Metals can be alloyed.

Properties of Nonmetals Insulators of heat and electricity. Dull surface. Low density, compared to metals. Low melting temperatures. Brittle solids

Properties of Metalloids Has properties of both metals and nonmetals Possess some characteristics of metals/some of nonmetals Reactivity depends on properties of other elements in reaction Often make good semiconductors

Sources www.chemistry.mtu.edu/~kmsmith/SYP/.../periodic%20table.ppt http://chemistry.about.com/od/elementgroups/a/metalloids.htm