2^nd Group

• **Default: ** Be, Mg, Ca, Sr, Ba, Ra respectively.

• Molecules:

  • *Neutral atoms: * 2 bonds are accepted.
  • Charged atoms: Each added charge decreases by one the number of possible bonds.
  • Radical: Each added radical decreases by one the number of possible bonds

• Ions:

  • Be²⁺, Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺ Ra²⁺ are accepted

• Radicals: · Me⁺ is accepted