Question

Write the configuration of cl and al, which of these has neon and which of these has argon gas configuration​

Answer 1

Answer:

In order to write the Argon electron configuration we first need to know the number of electrons for the Ar atom (there are 18 electrons). When we write the configuration we'll put all 18 electrons in orbitals around the nucleus of the Argon atom.

In writing the electron configuration for Argon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Argon go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we'll move to the 3p where we'll place the remaining six electrons. Therefore the Argon electron configuration will be 1s22s22p63s23p6.

Because the third energy level has eight electrons and is therefore full (3s23p6) it is called a noble gas.