Question

which element has a electron configuration of (1s^2 2s^2 2p^6 3s^2 3p^2)?
options:

• sulfur, s
• magnesium, mg
• carbon, c
• silicon, si

Explanation:

Step1: Calculate total electrons

Sum the exponents in the electron configuration: \(2 + 2 + 6 + 2 + 2 = 14\).

Step2: Find element with atomic number 14

The atomic number (number of protons, equal to electrons in neutral atom) is 14. From the periodic table, Silicon (Si) has atomic number 14.

Answer:

Silicon, Si