Part B - Purpose: To determine the trends if they exist, for atomic size and ionization energy in the Periodic Table. Ma

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Part B Purpose To Determine The Trends If They Exist For Atomic Size And Ionization Energy In The Periodic Table Ma 1 (138.6 KiB) Viewed 50 times

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Part B - Purpose: To determine the trends if they exist, for atomic size and ionization energy in the Periodic Table. Materials: Worksheet Graph Paper "M Procedure: 1. Use the information from the section of the periodic table. Be sure to give each graph a title and to label each axis. 2. For elements 3-20, make a graph of atomic radius as a function of atomic number. Plot atomic number on the X axis and atomic radius on the Y-axis. 3. For elements in Family 1(1A) and Family 2 (2A), graph period number vs. atomic radius. Use a different color or symbol for each line. 4. For elements 3-20, make a graph of ionization energy as a function of atomic number. Plot atomic number on the X-axis and ionization energy on the Y-axis. 5. For elements in Family 1(1A) and Family 2 (2A), graph period number vs. ionization energy. Use a different color or symbol for each line.

(HA) 13 (A) 14 (IVA) 16 (VIA) 18 VIA) 10 L 1.23 124 Be 0.89 215 Ne 15 (VA) 7 N 0.70 335 B 0.80 191 17 (VWA) 9 F 0.64 402 O 0.66 314 0.77 260 0.67 497 3 71 Na 7.57 119 12 Mg 1.36 176 13 ΑΙ 1.25 138 74 Si 1.17 188 15 P 1.10 242 16 s 1.04 239 17 CI 0.99 299 18 Ar 0.98 363 19 K 2.03 100 20 Ca 1.74 141 NUMBER ATOMIC Ooo 37 Rb 2.16 96 5 38 Sr 1.91 131 8 O 0.66 314 RADIUS ENERGY SYMBOL ATOMIC IONIZATION 55 Cs 2.35 90 56 Ba 1.98 120 6 1. Atomic Radius vs. Atomic Number

2. Period Number vs. Atomic Radius 3. lonization Energy vs. Atomic Number

4. Period Number vs. lonization Energy Analysis: 1. What happens to the atomic radius as the atomic number increases across a period? Why? As the positive charge of the atom increases the atomic radius decreases because the positive charge will bring electrons closer to the nucleus. 2. What happens to the atomic radius as the atomic number increases down a period? Why? 3. What happens to the ionization energy as the atomic number increases across a period? Why? 4. What happens to the ionization energy as the atomic number increases down a family? Why?

Conclusion: 1. Looking at the graph, explain the peaks and troughs of atomic radius. Hint: Think about electron configuration. 2. Looking at the graph, explain the peaks and troughs of ionization energy. Hint: Think about electron configuration. 3. Discussion: Write the most important concepts that you learned.