Electrons Valence Electrons- a Valance Electron Is Only Looking At

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Electrons Valence Electrons- a Valance Electron Is Only Looking At

Electrons In an atom there are available spaces in the electron cloud for electrons. They can be called energy levels, shells and orbitals(We only draw it like this, but they move) The first ring can hold up to 2 electrons. The second and third rings can hold up to 8 electrons In an uncharged atom, the protons equal the electrons The picture shows the available spots that electrons can go Valence Electrons- A valance electron is only looking at the last ring on the outside This periodic table is showing group 1 Lewis Dot Diagrams- Because each element has 1 valance electron, instead of drawing the entire atom we can now write the elements symbol with dots that represent how many valence electrons there are. All atoms in group 1 have 1 valence electron, so they all have 1 dot. Notice that the elements drawn above show the electrons for each atom. They ALL have 1 valence electron. The electron in the outside shell. If every atom in group 1 was drawn, they would ALL have 1 valence electron in the outermost shell. Every element in group 2 has 2 valence electrons! Instead of drawing the entire atom model, you can write the element symbol with at dot at the top and a dot at the bottom of the symbol. This represents the valence electrons (the electrons on the outer most shell). This is an example of 2 of the elements in group 2. Every element in group 2 has 2 valence electrons! The pattern continues for group 13 through group 18. It doesn’t work for the section in the center All elements in group 13 will have 3 dots, exactly like you see on B All elements in group 14 will have 4 dots, exactly like you see on C All elements in group 15 will have 5 dots, exactly like you see on N All elements in group 16 will have 6 dots, exactly like you see on O All elements in group 17 will have 7 dots, exactly like you see on F All elements in group 18 will have 8 dots, filling all 8 places Helium only has 2 valence electrons, but 2 is full on the 1st level so it fits with this group. .

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