The units of resistivity don't come out right.

10^-8 Ohm * m
or
m Ohm * cm

the 'm' should be a 'mu', but unfortunately they both look the same in the latin alphabet.

The Group 2 elements are called the alkaline earth metals. The Group 2 elements are:

• Beryllium
• Magnesium
• Calcium
• Strontium
• Barium
• Radium

The electronic configuration of the elements all consist of two s-electrons outside an inner core of electron corresponding to the previous inert gas: the group configuration is therefore ns².