{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

atomic-size-handout - Atomic size Patterns in Atomic Size...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Atomic size Atomic size Which a) Ne or Ar Is b) B or C Bigger c) P or Ge Patterns in Atomic Size Patterns in Atomic Size • Electron configuration for Br: [Ar]4s 2 3d 10 4p 5 , valence electron configuration for Br: 4s 2 4p 5 . • We often only focus on valence electrons: they are involved in reactions and determine size • Two factors affect size: n and the balance between attractions & repulsions in the atom. • Atomic size refers to the distance that the furthest (valence) electrons are from nucleus • It can affect the properties of atoms & elements Decreasing Atomic Size Across a Period Decreasing Atomic Size Across a Period • As the attraction between the +ve nucleus and the -ve valence electrons , the atomic size . • From left to right, size decreases because there is an increase in nuclear charge and Effective Nuclear Charge (# protons – # core electrons) • Each valence electron is pulled by the full ENC Li (ENC = 1) + + + Be (ENC = 2) + + + + B (ENC = 3) + + + + + Sizes of ions Sizes of ions
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online