New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

CHEM 101, Lecture notes Week 3

by: spencer.kociba

CHEM 101, Lecture notes Week 3 CHEM 101

Marketplace > Drexel University > CHEM 101 > CHEM 101 Lecture notes Week 3

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Electron configuration, orbital levels, shielding, penetration
General Chemistry
Monica Ilies
Class Notes
Chemistry, electron, Molecular Orbital Theory, atomic orbitals, shielding, penetration, electron-configuration
25 ?




Popular in General Chemistry

Popular in Department

This 5 page Class Notes was uploaded by spencer.kociba on Wednesday October 12, 2016. The Class Notes belongs to CHEM 101 at Drexel University taught by Monica Ilies in Fall 2016. Since its upload, it has received 7 views.

Similar to CHEM 101 at Drexel


Reviews for CHEM 101, Lecture notes Week 3


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 10/12/16
Spencer Kociba CHEM 101 Lecture notes Lecture 10/04/16 ● Bohr model of an atom ○ Developed model that explains how the structure  changes during energy transitions ● Quantized=the atom can only have certain amounts of energy ● Orbitals, Shells and Transitions ○ Distances between rings are proportional and stationary ○ Electrons emit radiation when they fall down orbitals  (higher to lower) ■ This emits a photon of light ○ “orbits”=shells ○ ‘orbitals”=subshells ○ higher→ lower=emission of energy ○ lower→ higher=absorption of energy ○ Quantum numbers determine shape, size and orientation  in space of the orbitals (to describe both particle and wave­like  behavior) ■ n=energy level ■ l=orbital type ■ m❑ =l position of orbital in an xyz plot ■ m❑ =s orientation of the spin of the  electron ■ ^^^these are all the quantum numbers that  completely describe the movement of the electron ○ Principal Quantum Number (n): The Energy Level ■ integer ≥ 1 ■ The larger “n” is, the higher energy in the  orbital ■ The larger the value of “n”, the energy  between orbitals lowers ○ Energies are described as negative ○ If energy=0, the electron escapes from the atom 1 ○ Energy❑ nR❑ ∙(h n2) ○ Each line in the emission spectrum corresponds to the  difference in energy between the two energy states ○ ***electrons in high energy states are unstable and  usually want to move to a lower state ○ For electrons in energy state n, there are (n­1) energy  states it can transition to ■ (can generate (n­1) lines) ○ Energy❑ electronrgy❑ finalstategy❑ initial state 1 1 ○ Δ Energy=−R❑ H[ 2 − 2 ] n ❑ f n ❑i ○ Orbitals ■ 1st=s (groups 1 and 2) ■ 2nd=p (groups 13­18) ■ 3rd=d (groups 3­12) ■ 4th=f (Atomic numbers 58­103) Spencer Kociba CHEM 101 Lecture notes Lecture 10/04/16 ● Columns have the most common property­wise in the periodic table ● period=row (1­7)  ○ also defines the number of orbitals  ○ Except for the transition metals ● Transition elements= columns 3­12 (vary more than most elements) ● Shielding: only happens with the lower energy levels (core electrons) ○ When the lower energy levels experience the full nuclear  charge, and the outer electrons experience less nuclear charge ○ Outer electrons cannot shield as efficiently as inner  electrons ○ When an electron penetrates, it experiences less  shielding and more nuclear charge ○ ● Penetration: when outer electrons overcome the force of the shielding  and experiences the full nuclear charge ○ Before penetration ■ Shielding is occurring here ○ After penetration ■ Shielding is overcome ● Electron Configuration ○ Electrons fill up horizontally first with spin, after all the  rows are filled then the electrons begin to pair up ○ As the number of shells increases, the energy increases ○ LEVELS OF ENERGY (increases from 1s to 4p) ● 4p ○ 3d ■ 4s ● 3p ■ 3s ● 2p ■ 2s ■ 1s ■ ■ ● Examples of elements and  their electron configurations/orbital diagrams ○ Hydrogen and  Helium do not experience shielding because there  is only 1 orbital level ● #of orbitals depends on how  many directions they can form ○ If all the  electrons are paired, the element is non­reactive ○ Ex. s= (sphere in an xyz plane) so there is only 1  posibility/combination of orbital orientation=1 box  in diagram ○ p=(several  spheres along different axes in xyz plane), there  are 3 different combinations of orientations so  there are 3 boxes in the electron configuration  diagrams


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Kyle Maynard Purdue

"When you're taking detailed notes and trying to help everyone else out in the class, it really helps you learn and understand the I made $280 on my first study guide!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.