Question

26 what element has the following ground state electron configuration? * (0.5 points) aluminum gallium phosphorus silicon

Explanation:

Step1: Count total electrons

Add up the exponents in the electron - configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}$. So, $2 + 2+6 + 2+1=13$.

Step2: Identify element

The atomic number of an element is equal to the number of electrons in its neutral ground - state. An element with an atomic number of 13 is aluminum.

Answer:

Aluminum