Question 4The element in this list with 5 electrons in the 2p energy level isA. FB. ClC. NeD. Ar

To determine which element has 5 electrons in the 2p energy level, we need to analyze the electron configurations of each of the elements provided in the options.

1. Break Down the Problem

   • Identify the number of electrons in the 2p subshell for each option.

2. Relevant Concepts

   • The general electron configuration format is:
     • 1s, 2s, 2p, 3s, 3p, etc.
   • The 2p subshell can hold a total of 6 electrons, but we are looking for the element with 5 electrons in this subshell.

3. Analysis and Detail

   • A. F (Fluorine): Electron configuration is 1s² 2s² 2p⁵. (5 electrons in the 2p level)
   • B. Cl (Chlorine): Electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁵. (There are 2p⁶ electrons in the 2p level)
   • C. Ne (Neon): Electron configuration is 1s² 2s² 2p⁶. (6 electrons in the 2p level)
   • D. Ar (Argon): Electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶. (6 electrons in the 2p level)

4. Verify and Summarize

   • From the analysis, only Fluorine (F) has 5 electrons in the 2p subshell.

Final Answer

The element in this list with 5 electrons in the 2p energy level is A. F (Fluorine).