• anonymous
  • katieb
See more answers at
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

Get this expert

answer on brainly


Get your free account and access expert answers to this
and thousands of other questions

  • anonymous
The electron configuration for an element is the arrangement of electrons in the orbits (or shells) of a neutral atom. Shells closer to the nucleus have higher binding energy. For example, there are eleven electrons in a sodium atom (atomic number 11). Scientists have measured the quantities of energy needed to remove these electrons one by one from a sodium atom. It is quite easy to remove the the first electron. The next 8 are difficult to remove. Finally, it becomes really hard to remove the last two electrons, which are held very powerfully because they are the closest to the nucleus. This is just a common representation of electron configuration.
  • anonymous
Do you have a periodic table? If so then... Simply look at Group One (the first column) which are the alkali metals. As they are in the same group you know they all have the same number of electrons in the outer shell. Group one elements have one electron in the outer shell. Next look at the periods (rows) this tells you how many shells an atom has. Period 3 elements all have 3 shells. So if you take sodium, it is in period 3 so has 3 shells. Remember the 1st shell has a capacity of 2 electrons, and each after has 8. EAch shell must be full before the next shell can contain electrons. So the electron configuration of sodium is 2:8:1

Looking for something else?

Not the answer you are looking for? Search for more explanations.