Electron distribution elements 1-18

Learn how the electrons are distributed in elements 1 through 18.

When distributing electrons in these elements follow these guidelines.

• Shell 1 or K shell can hold 2 electrons
• Shell 2 or L shell can hold up to 8 electrons
• Shell 3 or M shell can hold up to 8 electrons

The valence electrons are the electrons in the outer shell.
Period 1 These elements will have 1 valence electron.

Element 1 is Hydrogen in group 1  and contains one energy shell and 1 electron.

Element 2 Helium period 1 group 18 and is the one exception because it has 2 valence electrons in the outer shell

 Period 2 which each has 2 energy shells.

Element 3 Lithium found in group 1 has 2 electrons in k shell and 1 valence electron in L

Element 4 Beryllium is found in group 2 and has 2 electrons in k shell and 2 valence electrons in L

Element 5 Boron Is found in group 13 and has 2 electrons in k and 3 valence electrons in L

Element 6 Carbon Is found in group 14 and has 2 electrons in k and 4 valence electrons in L

Element 7 Nitrogen Is found in group 15 and has 2 electrons in k and 5 valence electrons in L

Element 8 Oxygen Is found in group 16 and has 2 electrons in k and 6 valence electrons in L

Element 9 Fluorine Is found in group 17 and has 2 electrons in k and 7 valence electrons in L

Element 10 Neon Is found in group 18 and has 2 electrons in k and 8 valence electrons in L

Period 3 with 3 electron shells

Element 11 Sodium Is found in group 1 and has 2 electrons in k and 8 electrons in L and 1 valence electron in m

Element 12 Magnesium Is found in group 2 and has 2 electrons in k and 8 electrons in L and 2 valence electrons in m shell.

Element 13 Aluminium and has 2 electrons in k and 8 electrons in L and 3 electron in m

Element  14 Silicon is found in group 1 and has 2 electrons in k and 8 electrons in L and 4 electron in m.

Element  15 Phosphorus Is found in group 1 and has 2 electrons in k and 8 electrons in L and 5 electrons in m

Element 16 Sulfur Is found in group 1 and has 2 electrons in k and 8 electrons in L and 6 electrons in m

Element  17 Chlorine Is found in group 1 and has 2 electrons in k and 8  electrons in L and 7 electrons in m

Element  18 Argon Is found in group 1 and has 2 electrons in k and 8 electrons in L and 8 electrons in m

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