Step-by-step explanation:
Based on their electrical conductivity, the elements can be ranked from most conductive to least conductive as follows:
Chromium - Chromium is a metal and is a good conductor of electricity. It has a high electrical conductivity and is used in electrical applications such as wiring and electrical contacts.
Germanium - Germanium is a metalloid and has a moderate electrical conductivity. It is used in semiconductors and transistors in electronic devices.
Iodine - Iodine is a non-metal and is a poor conductor of electricity. It is not used in electrical applications due to its low electrical conductivity.
Therefore, the elements can be ranked in order of decreasing electrical conductivity as:
Chromium > Germanium > Iodine