Help with electron dot diagram?

Need help with orbital filling diagram and election dot?

• Need help with orbital filling diagram and election dot? I am litttle confused, like this was some direction to it. it said, only thos electrons in hte highest energy level need to be shown unless a "d" or "f" sublevel is partially filled. ex: oxygen is has two arrow that goes up and down for 2s then 4 arrow are going up and down and I don't get how 1s isn't in it. And the electron dot diagram for Oxygen had one dot on hte left then 2 dots on the top then 2 dots to the right then 1 dot on the bottom. Another example is Nitrogen. has two arrows for 2s then 3 arrows for 2p then 2 dots on the right then 1 dot on the top then 1 dot on the left then 1 dot on the bottom. I need help with boron, silicon, sulfur, calcium, arsenic, iodine, rubidium, chromium, gallium, platinum

• Answer:

  With oxygen, the electron configuration is 1s2,2s2,2p4. The 1s electrons aren't shown in an orbital filling diagram because they're not in the highest energy levels - those are the 2s2,2p4 electrons. The 2s would fill first, shown by one "up" arrow and one "down" arrow, or by a pair of dots on the electron dot diagram. Then the 2p orbitals would fill up, one electron per orbital, until each had an electron (shown by an "up" or a "down" arrow - usually "up"). Then they would start to fill with a second electron, shown by an arrow pointing the opposite direction. 1s |^ v| 2s |^ v| 2p |^ v| |^ | |^ | (it's not pretty, but it's the best I can do with this format) The dots in the electron dot diagrams just show the paired and single electrons in the outermost electron shells. Since oxygen has six electrons in the outermost shell, by necessity, some of them will be doubled up in their orbitals. Those are the paired dots in the electron dot diagrams. Nitrogen has 1s2, 2s2, 2p3 electron configuration. 1s | ^ v | 2s | ^ v | 2p |^ | |^ | |^ | Again, the 1s electrons aren't shown in the electron dot diagram, and in the 2nd level, the 2s electrons are a pair of dots, and the 2p electrons are each single dots.