Presentation on theme: "The Periodic Table I.History II.Arrangement of Elements III.Periodic Trends."— Presentation transcript:
The Periodic Table I.History II.Arrangement of Elements III.Periodic Trends
Dimitrii Mendeleev (1834-1907- Russian) (father of modern periodic table) Published system used today (1869) 2. Elements arranged by increasing mass 3. Left spaces for elements not yet discovered – predicted properties (scandium, gallium, germanium)
II. Arrangement of Elements A.Periodic Table - arrangement of elements in order of increasing atomic number so that elements with similar properties are in the same column PERIOD – horizontal row (7) FAMILY/GROUP vertical columns (1-18/1-8A) Periodicity - reoccurrence of similar properties of elements in groups
C. Special Groups on the Periodic Table ALKALIMETALSALKALIMETALS ALKALINEMETALSALKALINEMETALS TRANSITIONAL METALS NOBLEGASESNOBLEGASES HALOGENSHALOGENS BORONFAMBORONFAM CARBONFAMCARBONFAM NITROGENFAMNITROGENFAM OXYGENFAMOXYGENFAM
Reactivity A.Reactivity – measure of the tendency of an element to engage in chemical reactions by losing, gaining or sharing electrons 1. atoms of reactive elements are very likely to gain, lose or share electrons 2. atoms of reactive elements are likely to form chemical bonds with other elements
B. Reactivity and the Periodic Table 1. alkali metals (group 1) most reactive metals 2. alkaline earth metals (group 2) second most reactive group of metals 3. halogens (group 7A/17) most reactive nonmetals 4. noble gases (group 8/A18) least reactive Use the slides below to LIST a few properties each Family shares.