Question

what is the chemical symbol for the element that has the electron configuration described by the aufbau diagram above? enter the answer

Explanation:

Step1: Count electrons in each sub - shell

1s has 2 electrons (↓↑), 2s has 2 electrons (↓↑), 2p has 6 electrons (↓↑, ↓↑, ↓↑), 3s has 2 electrons (↓↑), 3p has 1 electron (↑).

Step2: Calculate total number of electrons

$2 + 2+6 + 2+1=13$.

Step3: Identify the element

The element with 13 electrons is aluminum, which has the chemical symbol Al.

Answer:

Al