History of the Periodic Table Each group will be given some cards. Can your group figure out what card is missing? What is it (number and suit)? Antoine Lavoisier 1743 - 1794 In the late 1790s, he compiled a list of the known elements at the time. This list contained 23 elements. But times were about to change… In the 1800’s, there were many changes in the world • Electricity • Spectrometer • Industrial Revolution As a result, there was an increase in the number of known elements • By the 1870, there were 70 known elements An agreement is reached… Then in the 1860’s, chemist agreed upon a method for accurately determining the atomic mass of elements. John Newlands 1838-1898 Noticed when elements were arranged by atomic mass, they repeated properties every 8th element. He used the word periodic to describe this pattern He gave it the name the Law of Octaves Unfortunately… Did not work for all the elements Criticized because of its association with music Did give others the idea of repeating properties - periodic We Hate It Lothar Meyer and Dmitri Mendeleev 1830-1895 1834 - 1907 Each made a connection between atomic mass and properties of elements The winner is… Mendeleev Mendeleev is given credit because his was published first In addition, Mendeleev predicted unknown elements However, not completely correct – new elements weren’t in correct order What do you notice about elements 27 & 28 and 52 & 53? Henry Moseley 1887-1915 Solved this problem by arranging the elements by increasing atomic number. The periodic repetition of chemical and physical properties of elements when arranged by atomic number is now known as Periodic Law Which leads to the Modern Periodic Table Boxes each with: Element Name Atomic Number Hydrogen 1 H 1.00794 Atomic Symbol Atomic Mass That are arranged by increasing atomic numbers Remember Atomic number = the number of protons = the number of electrons (if neutral) Atomic Mass on the Periodic table is the average mass of the isotopes • But the mass number of each isotope is the protons plus the neutrons Chemical Symbol The symbol that refers to the element First letter is capitalized, second letter (if applicable) is lower case Not all symbols are based on English names for the elements, some come from their Latin names or even other languages – Tin – Sn – stannum – Silver – Ag – argentum – Iron – Fe - ferrum – Antimony – Sb -stibium – Mercury – Hg - hydrargyrum – Lead – Pb – plumbum – Gold – Au - aurum – Copper – Cu – cyprium Columns and Rows The columns are called Families or Groups • Earlier Version had 1-8 followed by A or B Group A elements are called Representative Elements Group B elements are called Transition Elements • Modern Version labels the columns with 1-18 Rows are called Periods • Seven periods for the seven energy levels (rings) Classifying Elements Three Types of Elements • Metals • Nonmetals • Metalloids Metals Shiny when smooth and clean Solid at room temperature • Only exception - Mercury Good conductors of heat and electricity Most are ductile and malleable Most of the elements on the table are metals, which are in blue Nonmetals Upper Right side of the Periodic Table Generally brittle solids or gases Poor conductors of heat and electricity Bromine is the only liquid at room temperature “The Yellow Elements” Metalloids A.k.a – the semi-metals Boxes bordering the stair-step Physical and chemical characteristics of both metals and nonmetals “The Green Stair-stepping Elements”