Which of the following is a reasonable ground-state electron configuration?

1s^2 2s^2 2p^4 3s^2

1s^2 1p^6 2s^2 2p^6

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4d^10

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5

Question

Which of the following is a reasonable ground-state electron configuration?

 1s^2 2s^2 2p^4 3s^2

 1s^2 1p^6 2s^2 2p^6

 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4d^10

 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5

anonymous · Answer

@JFraser @sammixboo please help

jfraser · Answer

do you have a chart of the proper filling order?

anonymous · Answer

No

anonymous · Answer

I really dont understand electron configuration :/

anonymous · Answer

I think it is the last one though

anonymous · Answer

Because of 3s^2p>2s>1s

jfraser · Answer

the first option is wrong because the 2p level isn't filled (it needs 6 electrons before filling the 3s)
the second option is wrong because there is no 1p level
the third option is wrong because the level that fills after 4s is 3d, not 4d

that leaves only the last option correct. It has the right orbitals in the right order, with the proper number of electrons filling each orbital

anonymous · Answer

Okay thanks so much!

sammixboo · Answer

Sorry for not relying!!!