Aim How are Elements Organized in the Periodic
- Slides: 10
Aim: How are Elements Organized in the Periodic Table? DO Now: 1. How would you organize these buttons? 2. How do you think elements are organized in the periodic table? 3. Write at least one trend you notice about the elements in the periodic table.
Periodic Table Investigation 1. Look at the periodic. How are the elements organized from left to right? 2. What are the rows labeled as? 3. What are the columns labeled as? 4. What do you notice is the same for all elements within the same column?
History of the Periodic Table • The first periodic table was developed by chemist Dmitri Mendeleev; arranged elements in order of increasing atomic mass. (look at Te and I; not in order of increasing mass) • The modern periodic law states: elements arranged in order of increasing atomic numbers. • Elements are sorted into groups based on similar properties.
Periods and Groups Periods • Horizontal rows • The # of the period indicates the # of energy levels (shells) in the element • The # of outer electrons increases from left to right • Properties of elements change across a period Groups or Families • Vertical columns • Most elements within the same group have the same number of electrons in the last shell; therefore, have similar chemical properties
Why do elements within the same group have similar chemical properties • Elements within the same group combine with other elements in similar ways • Elements within the same group have the same number of valence electrons • Valence electrons are the electrons located in the last shell of the atom
Three Classes of Elements 1. Metals • Alkaline Earth Metals • Transition Metals • Inner Transition Metals 2. Metalloids 3. Nonmetals • Halogen • Noble Gases
Metals vs Non Metals Properties Metals • solids at room temperature are malleable • are ductile • have luster • good conductors of heat and electricity Properties of Nonmetals • many are gases at room temperature • not malleable, tend to be brittle in the solid phase. • surface is dull • poor conductors of heat and electricity
Metalloids • an element (e. g. , germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals
Question 1. Explain in terms of valence electrons why beryllium and magnesium have similar chemical properties. 2. Which one of the following is not a property of metals? a. ductility b. malleability c. good electrical conductivity d. having a dull appearance e. good heat conductivity
- Antigentest åre
- How are elements organized on the periodic table
- Describe how the modern periodic table is organized.
- The modern periodic table is organized by
- How is the periodic table organized
- How are elements organized
- Mendeleev organized the elements
- Elements are organized on the
- Five elements of aim
- The periodic table and periodic law chapter 6
- The periodic table and periodic law chapter 6