{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Atomic size
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
a) Ne or Ar b) B or C 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. Larger Larger Atomic size refers to the distance that the furthest (valence) electrons are from nucleus It can affect the properties of atoms & elements Which Is Bigger ?
Background image of page 2
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) + + + + +
Background image of page 3

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

View Full Document Right Arrow Icon
Sizes of ions Sizes of ions Ions are atoms that have either gained or lost electrons (so that the # of electrons is not equal to the # of protons) The size of an atom can change dramatically if it becomes an ion (reference: pg. 214) E.g. when sodium loses its outer electron to become Na + it becomes much smaller.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}