CHEM 101 Lecture Notes - Lecture 12: Diamagnetism, Valence Electron, Paramagnetism

74 views4 pages

For unlimited access to Class Notes, a Class+ subscription is required.

CHEM 101-Lecture 12-Periodic Table Trends
Review: Paramagnetism and diamagnetism
Paramagnetic atoms/ions have unpaired electrons, and interact with a magnetic field
Diamagnetic atoms/ions have only paired electrons, and do not interact with a magnetic
field
This can be used to determine the electron configuration of certain ions
Atomic and ionic size
Defined as the distance that the area of electron density extends from the nucleus
Moving across a period (row), atomic size decreases
Elements with more protons (moving to the right of the period) have a larger
nuclear charge, and therefore attract electrons more strongly
This causes them to have a smaller size, as their electrons are pulled
closer to the nucleus
The increased in electrons does not have a large effect because there is
very little screening between electrons in the same energy level
Moving down a group (column) of the periodic table, atomic size increases
As electrons are added to higher energy levels, the size of the energy levels, and
therefore the size of the atom, increases
Atomic radii on the periodic table:
https://www.thoughtco.com/element-size-on-the-periodic-table-608793
When an atom gains electrons and becomes an anion, it becomes larger than its
corresponding atom
There is more repulsion between the valence electrons, so they move farther
from the nucleus
Unlock document

This preview shows page 1 of the document.
Unlock all 4 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class