Skip to Content Go to sign in Skip to Primary Navigation Skip to Secondary Navigation Skip to Page Navigation Skip to Header Navigation Skip to Footer Navigation Read more about accessability options and our navigation

Physics Classroom is making strides to make our site accessible to everyone. Our site contains 6 navigation areas. The Primary, Secondary, and Page Level navigations have a screen reader version of their nav structure that allows using the left and right keys to navigate sibling navigation items, and up or down keys to navigate parent or child navigation items. The others can be navigated using tabs. The Primary Navigation handles the first 2 levels of site pages. The Secondary (which is not always available) handles the 3rd and 4th level of structure. The Page level navigation allows you to navigate the current page's headings quickly. The Header Navigation contains the Light/Dark Mode toggle, Search, Notifications and account login. The Breadcrumb Navigation contains the breadcrumb of the current page. If the current page has a breadcrumb, you can get to it by skipping to the content and tabbing in reverse (shift plus tab). The Footer Navigation contains links such as Privacy, Contact, about and terms. Some resources contain an Audio Player that can be activated by holding down the T key for 3 seconds, and then using K to pause and resume. While not every area of Physics Classroom is usable purely from keyboard and screen reader, we are committed to continue work on making this possible. If you have questions or need additional help, please use this link to contact us.

Return to screen reader navigation

Mission MAM3 Electron Energy Levels

Mission MAM3 pertains to the ordering of orbitals by energy and the rules describing how the orbitals fill with electrons. The mission consists of 36 questions organized into 9 Question Groups.

Learning Outcomes

  • The student should be able to identify the various energy sublevels for each energy level (or n value) and the relative ordering of those sublevels by energy value.
  • The student should be able to use the Aufbau principle, Hund's rule, and the Pauli exclusion principle to predict the order in which electrons enter various orbitals.
🚀︎ Launch Concept Builder

Getting Help

If you are not familiar with this topic, then you should first learn about the topic using our written Tutorial:

Return to Screen Reader Navigation