Question

which of the following electron configurations is correct for the element krypton? a) 1s22s22p63s23p6 b) 1s22s22p63s23p64s23d104p6 c) 1s22s22p63s23p64s23d104p5 d) 1s22s22p63s23p5

Explanation:

Step1: Recall krypton's atomic number

Krypton has an atomic number of 36, which means it has 36 electrons.

Step2: Write electron - filling order

Electrons fill orbitals in the order 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p. The s - subshell can hold 2 electrons, the p - subshell can hold 6 electrons, and the d - subshell can hold 10 electrons.

Step3: Fill electrons for krypton

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶ accounts for 2 + 2+6 + 2+6 + 2+10 + 6=36 electrons.

Answer:

c) 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶