Shell: s-block

H                                                  He
Li Be                               .  .  .  .  .  ..
Na Mg                               .. .. .  .  .. ..
K  Ca .. .. .  .. .. .. .. .. .. .. .. .. .. .. .. ..
Rb Sr .  .. .. .. .. .. .. .. .. .. .. .. .. .. .  ..
Cs Ba .. .. .. .  .. .. .. .. .. .. .. .. .. .. .. ..
Fr Ra .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..

      .. .. .. .. .. .. .. .. .. .. .. .. .. ..
      .. .. .  .. .. .. .. .. .. .. .. .. .. ..

The s-block consists of elements in Groups 1 and 2 plus Helium. The
valence electrons of these elements are in the s-shell. This
spherical shaped shell holds at most 2 electrons, and has an
azimuthal quantum number of 0. The "s" stands for "sharp".

 1 H  Hydrogen
 2 He Helium
 3 Li Lithium
 4 Be Beryllium
11 Na Sodium
12 Mg Magnesium
19 K  Potassium
20 Ca Calcium
37 Rb Rubidium
38 Sr Strontium
55 Cs Cesium
56 Ba Barium
87 Fr Francium
88 Ra Radium

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