Electronic structure 2

Below are some more electronic structures. Remember - you need to learn the electronic structures of the first 20 elements.

The number of electrons in the highest occupied energy level of each atom is the same as the element's group number.

Electronic structures of elements

Numeric format	Electrons	Periodic table group
F 2,7	Fluorine atoms have nine electrons. Two of these fit into the first energy level. The remaining seven fit into the second energy level.	Group 7
Ne 2,8	Neon atoms have ten electrons. Two of these fit into the first energy level. The remaining eight electrons fit into the second energy level. Because its highest occupied energy level is full, neon is stable [stable: Atoms are stable if their outer shell contains its maximum number of electrons. ] and unreactive.	Group 0 - that is, the eighth group
Na 2,8,1	Sodium atoms have 11 electrons. Two of these fit into the first energy level, eight into the second energy level. The last one fits into the third energy level.	Group 1
Ca 2,8,8,2	Calcium atoms have 20 electrons. Two of these fit into the first energy level, eight into the second energy level, another eight into the third energy level. The last two fit into the fourth energy level.	Group 2