Grp II - melting points

[KathChem82]

this is the only answer i can give:

Although in general, the melting point of group II elements are decreasing, the melting point for magnesium is anomalously low. This is because beryllium and magnesium have different metallic structures from the other elements in the group:

Beryllium and Magnesium have a hexagonal closed-packed structure. The top and bottom layers contain six atoms at the corner of the hexagon and a single atom in the center of each hexagon. The middle layer contains three atoms nestled between the atoms of the top and bottom layers, hence, the name close-packed.
Calcium and Strontium have a face-centred cubic structure. The unit cell consists of eight atoms at the corners of a cube and one atom at the center of each of the faces of the cube.
Barium has a body-centred cubic structure. the unit cell consists of eight atoms at the corners of a cube and one atom at the body center of the cube.

[thor3436]

im thinking it has to do w/ the electron configuration i'm going to check the orbitals and see if anything is different . just go to www.ptable.com click on orbitals in the upper right
and point the cursor at magnesium

[thor3436]

theres not much of a difference but from beryllium has [ i hope i say this right .]
a 1s2,2s2 electron shell Mg has
1s2,2s2,2p6,3s2 electron shell im no chemist so i'm sure i'm wrong
[PLEASE TELL ME IF I'M WRONG. ]