Copyright

Modern Atomic Theory: Electron Clouds, Schrodinger & Heisenberg

Modern Atomic Theory: Electron Clouds, Schrodinger & Heisenberg
Coming up next: The Atom

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
 Replay
Your next lesson will play in 10 seconds
  • 0:00 Atoms
  • 0:45 Atomic Theory
  • 2:43 The Bohr Model
  • 3:10 Schrodinger and Heisenberg
  • 4:12 Modern Atomic Theory
  • 4:52 Lesson Summary
Save Save Save

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Log in or Sign up

Timeline
Autoplay
Autoplay
Speed

Recommended Lessons and Courses for You

Lesson Transcript
Instructor: Rebecca Gillaspy

Dr. Gillaspy has taught health science at University of Phoenix and Ashford University and has a degree from Palmer College of Chiropractic.

Does an atom look more like a solar system or a cloud? Learn how the early atomic theory has evolved into the modern atomic theory and changed the way science views the atom. Learn about contributions from Schrodinger and Heisenberg.

Atoms

When you think of an atom, you might picture a little solar system-like model with paths of electrons orbiting a centralized nucleus. This is the early atomic model that Niels Bohr and other scientific pioneers envisioned many years ago. But thanks to experimental advancements and some modern-day thinkers, like Erwin Schrodinger and Werner Heisenberg, we now believe that electrons look more like clouds than neatly orbiting planets. This new idea of what atoms look like is the basis of the modern atomic theory. Let's take a look at how science advanced from its early understanding of atoms to the modern view of today.

Atomic Theory

Scientists have known about atoms long before they could produce images of them with powerful magnifying tools. In fact, atoms get their name from the Ancient Greek word atomos, which means 'something that is not able to be divided'.

Because atoms could not be seen, the early ideas about atoms were mostly founded in philosophical and religion-based reasoning. Near the end of the 18th century, new ways to conduct experiments helped researchers build their scientific understanding of atoms. This lead to the first atomic theory, which stated things like, all matter is made up of atoms, elements are composed of only one type of atom, and atoms can combine with other atoms to make more complex substances.

This first atomic theory explained a lot, but as science continued to advance, new information and new discoveries made it clear that the theory needed to be updated. One of these new discoveries came at the end of the 19th century, with the discovery of a subatomic particle, called an electron. The word 'subatomic' literally means 'inside an atom'. Because of this discovery it became clear that atoms might not have been named correctly and that they could be divided into smaller parts.

When electrons were first discovered, scientists knew they were part of the atom, but they didn't know where they belonged. At first the thought was that electrons floated throughout the atom, like pieces of fruit floating in pudding, as if the atoms were simply soft blobs of matter. But, through more experimentation, it was found that most of the matter within atoms is centralized. By the early 20th century, this centralized matter came to be recognized as the nucleus of the atom.

The Bohr Model

In 1913, a scientist by the name of Niels Bohr expanded on all of the past research about atoms, and came up with the idea that negatively charged electrons orbit a positively charged nucleus in definite paths. This concept came to be known as the Bohr model. This was the first real look at the solar system-like model of an atom that we mentioned at the beginning of this lesson.

Schrodinger & Heisenberg

Bohr's model was a big step forward in our understanding of the atom, yet it was still relatively simple and did not fully explain the nature of complex atoms that contained many electrons. This more complex understanding took shape thanks to the work of two 20th century scientists: Erwin Schrodinger and Werner Heisenberg.

To unlock this lesson you must be a Study.com Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use Study.com

Become a Study.com member and start learning now.
Become a Member  Back
What teachers are saying about Study.com
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account
Support