Sort by bash loop command and/or sort

[Budi]

How to sort the numbers such the exponent form numeric values or the
numbers such these?

TABLE OF E.G

A     2.8 x 10-8
B     3.9 x 10-7
C      1.3 x 10-6
D      0.6-0.9 x 10-7
E      6 x 10-8

Thought trying it simple:

$ cat Table_of_eg  | sort -k2.1h

    TABLE OF E.G

D      0.6-0.9 x 10-7
C      1.3 x 10-6
A     2.8 x 10-8
B     3.9 x 10-7
E      6 x 10-8
But failed !
Should've given numbers with less (greater negative if any) exponent
first, if such is same then the less number followed by the next and
so on ordered in such rule
Help solve it. Thanks before