2nd 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