Which energy sublevel is being filled by the elements K to Ca?

Question

Quizplus · Accepted Answer

The elements K (potassium) to Ca (calcium) are in the fourth period/row of the periodic table, meaning they have four energy levels. The first three energy levels are already filled with electrons for these elements, leaving the fourth energy level to be filled. The sublevel within the fourth energy level that is being filled is the 4s sublevel, making B the correct choice.

Which Energy Sublevel Is Being Filled by the Elements K