Question

electron configuration and noble gas notation
the orbital diagram below represents which element?
o magnesium
o silicon
o phosphorus

Explanation:

Step1: Count electrons in each orbital

1s has 2 electrons, 2s has 2 electrons, 2p has 6 electrons, 3s has 2 electrons, 3p has 3 electrons.

Step2: Calculate total number of electrons

$2 + 2+6 + 2+3=15$ electrons.

Step3: Identify element by atomic number

The atomic number is equal to the number of electrons. Phosphorus has an atomic number of 15.

Answer:

phosphorus