Question

which box shows an electron in the electron cloud that is in the energy level that would be completely filled first? select the correct answer.

Explanation:

Electrons fill energy levels from the innermost (closest to the nucleus) outwards. The innermost energy level (first shell) can hold up to 2 electrons. The dashed - circled electron closest to the nucleus (in the innermost energy level) is in the energy level that gets filled first, as lower energy levels (closer to nucleus) are filled before higher ones.

Answer:

The electron in the dashed - circle on the innermost electron shell (the one closest to the nucleus, with the other electron in that shell) is in the energy level filled first. (Assuming the dashed - circled electron on the innermost orbit is the one, based on electron filling order: 1st shell fills first, holds 2 electrons. So the dashed electron in the innermost orbit (with the other - in that orbit) is in the level filled first.)