Question

I'LL MEDAL AND FAN FOR THE HELP!

4. What are the shorthand and longhand electron configurations for chlorine?

5. Explain how the periodic table can help in writing electron configurations.

Answer 1

Have you tried it?

Answer 2

I don't understand it. I managed the first 3 questions, I just don't know these two. @aaronq

Answer 3

It's simple. You add electrons into the orbitals (s, p, d, f) in order increasing energy - which is dictated by the AUFBAU principle. (see attachment).

\(\sf \huge 1s^2\)

here 1 is the principal energy level, s is the orbital and 2 is the number of electrons in that orbital.

So say, you had to write the electronic configuration for nitrogen. N has 7 electrons.

so first 2 electrons go into the 1s orbital, then 2 into the 2s orbital, then 3 into the 2p orbital. The configuration looks like this:

\(\sf \huge 1s^22s^22p^3\)

The shorthand only includes the valence electrons, using the nearest (going backwards) noble gas as representation for the inner (core) electrons.

so for N it's \(\sf \huge [He]2s^2sp^3\)

Answer 4

The periodic table can help you with this because it's divided into the orbitals (see attachment), so if you follow it downwards and to the right, it tells you the electronic configuration.

Answer 5

That attachment is kinda small, here is the link http://www.drcruzan.com/Chemistry_PeriodicTable.html