SucceedSchool.com, learn to succeed. Electron Structure. Electrons form orbits,
or shells, around a nucleus. These orbits have very specific maximum capacities.
The first orbit closest to the nucleus can fit up to two electrons. The second
can fit eight and the third can also fit eight. Two, eight, eight.
You fill orbits from the centre closest to the nucleus, moving out.
We normally draw the electrons in pairs in orbits two and three just to make
them easier to count. We know how many electrons we need to add because the
number of electrons is always the same as the number of protons, which we can
get from the periodic table entry. If you have 19 or 20 electrons to draw then
they won't all fit into these first three orbits, so just start filling up
the fourth orbit. You won't be asked to draw more electrons than this at this
level. For a more detailed explanation of the periodic table please check this
video, and to learn more about electron structure check this video, and click
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