{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

CH 101 notes 9-7

CH 101 notes 9-7 - Valence electrons The periodicity of the...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
The periodicity of the chemical properties results from the periodicity in the valence electron configurations. Valence electrons Section 3.1 In something closer to English: As one moves across a row of the periodic table, the chemical properties of each element change gradually. The changes are the result of changes in the number of valence electrons. Z eff = Z - σ Attraction to nucleus felt by electron # protons in nucleus Shielding constant Z eff ~ Z σ & Effective Nuclear Charge σ inner σ outershell Section 3.2 Z eff ~ Z - inner + σ outershell ) Z eff Z ~ H: 1 p + & 1 st e - Z eff Z ~ He: 2 p + & 2 nd e - σ outershell - Z eff Z ~ Li: 3 p + & 3 rd e - σ inner - Z eff Z ~ Be: 4 p + & 4 th e - ( σ inner + σ outershell ) - Z eff Z ~ B: 5 p + & 5 th e - ( σ inner + σ outershel l ) - Z eff Z ~ C: 6 p + & 6 th e - ( σ inner + σ outershell ) - Z eff Z ~ N: 7 p + & 7 th e - ( σ inner + σ outershell ) - Z eff Z ~ O: 8 p + & 8 th e - ( σ inner + σ outershell ) - Z eff Z ~ F: 9 p + & 9 th e - ( σ inner + σ outershell ) - Z eff Z ~ Ne: 10 p + & 10 th e - ( σ inner + σ outershell ) - Z eff Z ~ Na: 11 p + & 11 th e - σ inner - 1 1 1.7 1.3 2.0 2.6 3.3 3.9 4.6 5.2 5.9 2.2 + Section 3.2 2 + + + + + 3 + + + + + + 4 5 + + + + + + 6 + + 7 + + + + + + + + 8 + + + + + + + + + 9 + + 10 + 11 Z eff ~ Z - inner + σ outershell ) 1 Section 3.2 2 + + + + + 3 + + + + + + 4 5 + + + + + + 6 + + 7 + + + + + + + + 8 + + + + + + + + + 9 + + 10 + 11 Z eff =10.7 Z eff =2.2 Z eff Trends smallest largest Metals Non- metals Section 3.2 The Periodic Table and Atomic Size, Orbital Energy, Electronegativity and Ionization Energy Energy ~ - Z 2 eff n 2 n 2 Radius (atomic size) Z eff ~ Electronegativity ~ + Z 2 eff n 2 Ionization Energy ~ + Z 2 eff n 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon