Presentation on theme: "Ch. 14 Periodic Trends Atomic Size – Quantum mechanical model doesn’t sharply define boundary to limit size – Atomic radius: ½ the distance between nuclei."— Presentation transcript:
Ch. 14 Periodic Trends Atomic Size – Quantum mechanical model doesn’t sharply define boundary to limit size – Atomic radius: ½ the distance between nuclei of 2 like atoms in a diatomic molecule Atomic radius
Periodic Table of the Elements Atomic Size Ionic Size “Fatty Francium” Fr Trick to Remember
Ionization Energy – The energy required to remove an e - from a gaseous atom is called the ionization energy. – As you move from left to right across the periodic table the ionization energy increases b/c of the octet rule
Octet Rule: 8 e - in atom’s last energy level. (s 2 + p 6 ) - Noble Gases: highest ionization energies, don’t want to lose e - Li doesn’t take much energy to lose e- F want to gain an e-, therefore takes large amount of energy to pull off an e-
Ionization Energy Increase Ionization Energy (cont.)
Electronegativity The electronegativity of an element is the tendency for the atoms to attract e- when they are chemically combined with another element Noble Gases have NO electronegativity b/c they don’t gain e - Increase from left to right b/c of octet rule Decrease when move down a group b/c of shielding effect
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