Question #07af6

1 Answer
Jacob K.
Oct 26, 2017

4, 1, 1, #1/2#

Explanation:

Element 31 is gallium. It is in the 4th row. So your principal quantum number is 4. Be careful though, as the transition metals work differently.

The angular momentum #l# is 1 because it is in the p-block, so we label it p.

The last electron is the first in the 4p shell so the next quantum number is 1.

Spin, the final quantum number, is #1/2# simply because each electron has a positive or spin, and 2 electrons cancel out. This one electron in the 4p shell is not cencelled out.

It's helpful to memorize the order of electron shells, listed here:
images.flatworldknowledge.com
The diagonal arrows represent ascending order, starting at 1s and ending at 8s
Source: https://catalog.flatworldknowledge.com/bookhub/2273?e=ball-ch08_s03

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