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PERIODIC TRENDS: 1. ATOMIC RADIUS 2. IONIC RADIUS

PERIODIC TRENDS: 1. ATOMIC RADIUS 2. IONIC RADIUS. What is the atomic radius? What is an ion? What is the ionic radius? How does it change going across and down?. What is an A tomic Radius?. half of the distance between the two nuclei of two joined atoms of the same element.

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PERIODIC TRENDS: 1. ATOMIC RADIUS 2. IONIC RADIUS

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  1. PERIODIC TRENDS:1. ATOMIC RADIUS2. IONIC RADIUS What is the atomic radius? What is an ion? What is the ionic radius? How does it change going across and down?

  2. What is an Atomic Radius? • half of the distance between the two nuclei of two joined atoms of the same element

  3. What are the seven diatomic elements? • Diatomic Elements: two elements joined together • Hydrogen (H2) • Nitrogen (N2) • Oxygen (O2) • Fluorine (F2) • Chlorine (Cl2) • Iodine (I2) • Bromine (Br2) Made easy to remember…. Br I N Cl H O F (like a last name Brinclhof)

  4. Br I N Cl H O FWhere are they on the periodic table?

  5. Atomic Radius Trend In groups = as atomic number increases In periods = as atomic number increases Is there a part missing?

  6. Trends show general rules

  7. WHY? • In groups: adding more energy levels • In periods: size of nuclear charge

  8. What is an ion? • A ✚ or − charged atom Oxygen Atom Silicon Ion Oxygen Ion Silicon Atom

  9. CATION • see a + ion • metals lose e- and become more + • become smaller Ion: 11p+ 12 n 10 e- n=2 Overall charge = +1 Atom: 11p+ 12 n 11 e- n=3 Overall charge = 0

  10. ANION • A negative ion , a – ion • NONmetals gain e- and become more – • become larger Atom Ion

  11. IONIC RADIUS TREND • Ionic size changes b/c: • CATIONS get smaller as e- are drawn in closer by + nuclear charge • ANIONS get bigger as e- cloud spreads out

  12. IONIC RADIUS TREND • In groups = increase as you go b/c more energy levels • In periods = as you go across b/ce- cloud shrinks as e- are lost

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