 Objectives  Today I will be able to:  Describe how the trends of ionic radius and electron affinity change across a period and down a family  Compare.

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Presentation transcript:

 Objectives  Today I will be able to:  Describe how the trends of ionic radius and electron affinity change across a period and down a family  Compare the atomic radius, ionization energy, electronegativity, ionic radius and electron affinity of 2 or more elements  Informal assessment: monitoring student questions and interactions as we complete the practice  Formal assessment: analyzing the students practice and exit ticket  Common Core Connection  Model with mathematics  Look for and express regularity in repeated reasoning

 Evaluate: Warm-up  Explain: Electron Affinity/Ionic Radius Notes  Elaborate: Periodic Trends Practice  Evaluate: Exit Ticket

 For the following set of elements: CaSrBaRa  Circle the element that has the smallest atomic radius  Underline the element with the smallest ionization energy  Box the element with the greatest electronegativity value

 Today I will be able to:  Describe how the trends of ionic radius and electron affinity change across a period and down a family  Compare the atomic radius, ionization energy, electronegativity, ionic radius and electron affinity of 2 or more elements

 Finish the practice from class  Periodic Table Quiz – Thursday, November 20

 Warm-Up  Ionic Radius/Electron Affinity Notes  Periodicity Review  Periodic Trends Practice  Exit Ticket

 When an atom gains or loses electrons the size of the radii change  Ionic radius is different for cations and anions

 Example: Mg 2+  Two electrons are removed  The radius gets smaller  Why?  Less repulsion between the electrons and the same number of protons in the nucleus pulls the electrons closer

 Example: Cl 1-  One electron is added  The radius gets larger  Why?  More repulsion between the electrons and the same number of protons in the nucleus spreads the electrons farther apart

 Energy change that occurs when an atom gains an electron  Across a period  Energy becomes more negative (more energy is released)  Down a family  Energy becomes less negative down a family (less energy is released0

 Can there be more than one? Why so?  What we have talked about so far has been 1 st ionization energy  There are actually as many ionization energies as there are electrons for an element !

Complete the practice at your desk. We will review selected responses as a class. Please ask Mr. Klotz for help If you have questions.

 Which of the following ions would have a smaller ionic radius? Explain why it would be smaller F 1- Na 1+