2 Compare and contrast how the way in which your group and the modern periodic table are organized.
3 Periodic TableThe modern periodic table organizes the elements in a particular way.A great deal of information about an element can be gathered from its position in the period table.For example:You can predict with reasonable accuracy the physical and chemical properties of an element.You can also predict what other elements a particular element will react with chemically.Understanding the organization and plan of the periodic table will help you obtain basic information about each of the 118 known elements.
5 Key to the Periodic Table Elements are organized according to their atomic number, usually found at the top of the square.The atomic number refers to the number of protons each atom of that element has.For instance, hydrogen has 1 proton, so it’s atomic number is 1.The atomic number is unique to that element. No two elements have the same atomic number.
6 What’s in a square?Different periodic tables can have other bits of information about an element, but usually contains:atomic numbersymbolatomic massnumber of valence electronsstate of matter at room temperature.
7 Atomic NumberThis refers to how many protons an atom of that element has.Symbolized by the letter “Z”No two elements, have the same number of protons.HZA
8 H A Z Atomic Mass Atomic Mass refers to the “weight” of the atom. Symbolized by the letter “A”It is derived at by adding the number of protons with the number of neutrons.HZAThis is a helium atom. Its atomic mass is 4 (protons plus neutrons).What is its atomic number?H
9 Mass Number and Atomic Number # of Protons + # of NeutronsAtomic Number# of ProtonsRemember:# of Protons = # of Electrons
10 Atomic Mass and Isotopes Why is the atomic mass on the periodic table a non- whole number?Mass number is the total of the number of protons plus the average number of neutronsStable naturally occurring isotopesNumber of isotopes vary between elementsRemember an isotope has the same number of protons, but different number of neutronsWhat happens to the number of electrons between isotopes? Why?
11 C Cu Symbols Carbon Copper All elements have their own unique symbol. It can consist of a single capital letter, or a capital letter and one or two lower case letters.CCarbonCuCopper
13 Properties of Metals What are some examples and properties of metals? Metals are good conductors of heat and electricityMost metals are shinyMetals are ductileThey can be stretched into thin wiresMetals are malleableThey can be pounded into thin sheetsA chemical property of metal is its reaction with water which results in corrosion.
14 Properties of Non-Metals Non-metals are poor conductors of heat and electricityNon-metals are not ductile or malleableSolid non-metals are brittle and break easilyMost are dullMany non-metals appear naturally as gasesSulfur
15 Properties of Metalloids Metalloids (semi-metals) have properties of both metals and non-metalsThey are solids that can be shiny or dull.They conduct heat and electricity better than non- metals but not as well as metalsThey came made semi-conductorsThey are ductile and malleableSilicon
17 FamiliesColumns of the periodic table are called families (also known as groups)Elements in each family have similar propertiesExample, lithium (Li), sodium (Na), potassium (K), and other members of family IA are all soft, white, shiny metalsAll elements in a family have the same number of valence electrons
19 Periods Each horizontal row of the periodic table is known as a period The elements in a period are not alike in propertiesThe properties of the elements change greatly across a given rowThe first element in a period is always an extremely active solid, while the last element in a period is always an inactive gas.