Atomic structure in 3D: the first 20 elements
Pick an element from hydrogen to calcium to see its nucleus and electrons in shells, with its electron arrangement, group and period, and the ion it forms.
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Questions students ask
What is the electron arrangement of sodium?
2, 8, 1: two in the first shell, eight in the second and one in the third.
How many electrons fit in each shell?
For the first 20 elements, 2 in the first shell and 8 in each of the next two.
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