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Unformatted text preview: Atomic Size Atomic Radius = half the distance between two nuclei of a diatomic molecule. Radius } Influenced by three factors: 1. Energy Level 2. Charge on nucleus Trends in Atomic Size Higher energy level is further away. More charge pulls electrons in closer. 3. Shielding effect (blocking effect?) Group trends
As we go down a group... each atom has another energy level, so the atoms get bigger. H Li Na K Rb As you go across a period, the radius gets smaller. Electrons are in same energy level. More nuclear charge. Outermost electrons are closer. Periodic Trends Na Mg Al Si P S Cl Ar Rb K Atomic Radius (nm) Overall
Na Li Ar H Ne Kr 10 Atomic Number Trends in Ionization Energy
The amount of energy required to completely remove an electron from a gaseous atom. Removing one electron makes a 1+ ion. The energy required to remove the first electron is called the first ionization energy. Ionization Energy
The second ionization energy is the energy required to remove the second electron. Always...
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- Spring '10