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5 – 3 Electron Configuration and Periodic Properties. Atomic Radius. As you move down a group it increases The outermost e - are being added to higher energy levels (further from the nucleus. Atomic Radius. As you move across a period, it decreases - PowerPoint PPT Presentation
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Atomic Radius
• As you move down a group it increases
• The outermost e- are being added to higher energy levels (further from the nucleus.
Atomic Radius
• As you move across a period, it decreases
• Even though e- are being added, they are added to the same energy level (same distance from the nucleus).
Atomic Radius
• The charge on the nucleus increases as you move across the period and so it has a “tighter” hold on the e- being added.
Shielding Effect
• The reduction of the attractive force between a nucleus and its outer electrons due to the blocking effect of inner electrons.
Ion
• An atom that has gained or lost an e-
• If it has gained an e-, it will be _____.
• If it has lost an e-, it will be _____.
Ionization Energy
• As you go down a group, it decreases
• Shielding effect and electrons are being added to higher energy levels.
Ionization Energy
• As you move across a period, it increases
• The charge on the nucleus increases as you move across the period and so it has a “tighter” hold on the e- being added.
Electron Affinity
• The attraction of an atom for an additional e-
• Metals tend to have low EA
• Non-metals tend to have high EA
EA
• As you move down a group, EA decreases.
• Shielding Effect and electrons are being added to higher energy levels.
EA
• It increases as you move across the periodic table.
• The charge on the nucleus increases as you move across the period and so it has a “tighter” hold on the e- being added.
Electronegativity
• Tendency for an atom to attract e- to itself when combined with another atom.
• F is the most EN
• EN decreases as you move down a group
• EN increases as you move across a period
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