Periodic Trends PDF

Lesson At the end of the lesson, the learner should have: 1. described the trends of elements according to their atomic size, ionization energy, metallic property, and electronegativity; (K) 2. analyzed and arranged elements according to their atomic radius (size), metallic property, ionization ene...

Lesson At the end of the lesson, the learner should have: 1. described the trends of elements according to their atomic size, ionization energy, metallic property, and electronegativity; (K) 2. analyzed and arranged elements according to their atomic radius (size), metallic property, ionization energy, and more electronegativity; (S) and 3. stated the importance of trends in periodic table of elements. (A) 1980’s 1990’s Trends a general direction in which something is developing or changing. Arranging Elements Below are 8 hypothetical elements. Consider that you are one of the scientist who wants to provide order/arrangement of elements. Arrange the 8 hypothetical elements horizontally based on the data given. Legend: Solid Liquid Gas Periodic trends are specific patterns in the properties of chemical elements that are revealed in the periodic table of elements. Periodic Trends 1. Atomic radius 2. Metallic property 3. Ionization energy 4. Electronegativity Atomic radius is defined as one- half of the distance between the two nuclei of two adjacent atoms that are bonded together. Ionization energy is the energy needed to remove an electron from a gaseous atom. Metallic property is the name given to the set of chemical properties associated with elements that are metals. Electronegativity of an element is the attractive force of an atom to attract electrons. Chemists use periodic trends as a tool to quickly predict an element's properties. Atomic Radius Metallic Property Ionization Energy Electronegativity  Atomic Radius Metallic Property Ionization Energy Electronegativity 1. Oxygen and Beryllium *Which of the two has… - greater atomic size? - greater electronegativity? - lesser metallic property? - lesser ionization energy? 2. Magnesium and Strontium *Which of the two has… - greater atomic size? - greater electronegativity? Exercise Arrange the elements in increasing atomic size: 1. Oxygen, Lithium, Carbon 2. Cesium, Lithium, Potassium Arrange the elements in increasing metallic property: 1. Sodium, Magnesium, Aluminum Arrange the elements in decreasing electronegativity: 1. Sodium, Lithium, Hydrogen