THE FIRST TWENTY ELEMENTS

	1A	2A	3B	4B	5B	6B	7B	8	1B	2B	3A	4A	5A	6A	7A	0
Period 1	1															2
Period 2	3	4									5	6	7	8	9	10
Period 3	11	12									13	14	15	16	17	18
Period 4	19	20

Click on the number of an element to see a Bohr diagram of that element.

Click on a group number to see the Bohr diagrams for that group.

Click on a period to see all the Bohr diagrams for that period.