Which of the following shows three elements in order of decreasing electronegativity?
a)br, cl, f
b) f, o, n
c) se, s, o
d) c, n, o

The correct answer is option D which is the decreasing order of conductivity is Mn, O, Ge.

Explanation:

You can easily answer this if you know the periodic trends. For the property of electrical conductivity, it decreases across a period and decreases also down a group. Thus, the most conductive element must be Mn, while the least conductive one is Ge. So, the answer is: -Mn, O, Ge