Question

which has a higher energy, the 4s or the 3d subshell?

Answer 1

3d

Answer 2

i thought that the closer to the nucleus the electron is the high the energy level,, and the farther out the energy becomes lower??

Answer 3

The energy increases beginning with 1s all the way up to 7p. Like this 1s-2s-2p-3s-3p-4s-3d-4p-5s and so on.

Answer 4

thank you sheen100

Answer 5

what element is isoelectronic with oxide?

Answer 6

@LewisDot : Your previous question is interesting - electrons first enter the 4s subshell and fill it (as in the Ca atom), but when the 3d subshell is almost half-filled or almost fully-filled, an electron from the 4s subshell occupies the vacant orbital in the 3d subshell, as a half-filled 3d subshell and a fully-filled 3d subshell is more electronically stable than a fully-filled 4s subshell.
So for oxide (with 10 electrons), can you figure out which element is isoelectronic with this configuration?