Electronic structures of atoms quiz

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
The energy level number of an atom is called the principal number. The third energy level can hold a maximum of electrons. The outer electrons of an atom are called electrons. Negative ions are formed by the of electrons.

An orbital is a region of space where an of a particular energy is most likely to be found. s-orbitals are whilst p-orbitals are in shape. The third energy level has s-orbital, p-orbitals and d-orbitals. Each orbital can hold a maximum of electrons of opposite .