Which element does the following electron configuration correspond to 1s2 2s2 2p6 3s2 3p4?

The electron configuration 1s² 2s² 2p⁶ 3s² 3p⁴ corresponds to the element sulfur (S).

Here’s the breakdown of the configuration:

• 1s²: 2 electrons in the first shell (1st energy level)
• 2s²: 2 electrons in the second shell, subshell s
• 2p⁶: 6 electrons in the second shell, subshell p
• 3s²: 2 electrons in the third shell, subshell s
• 3p⁴: 4 electrons in the third shell, subshell p

When we add up all the electrons, we get a total of 16 electrons (2 + 2 + 6 + 2 + 4 = 16). This number of electrons corresponds to the atomic number of sulfur, which is also 16. Therefore, the element with this electron configuration is sulfur.