Electricity
The form of energy that is not conducted by most metals is sound because if you want to test that you would have to clank it together and it would not make a sound.
light
when they form compounds with metals or other non-metals
It isn't. Electricity is conducted by lots of substances, for example most metals.
No
most transition metals form ions with a 2+ charge.
Metals form cations. They loose electrons.
Francium and cesium, the two with the highest atomic numbers.
Metals combine with other metals to form alloy solutions, they can form solutions with other compounds by being dissolved in them, in most cases. As well, they form ionic bonds with nonmetals.
Group-17 are most reactive non-metals. They form halogens.
Metals are usually found in the Earth's crust, in the form of ores.
Electricity, in the form of electrons, is the most common type of energy that is transported through metal wires. Metal wires are excellent conductors of electricity due to the ability of metals to easily allow the flow of electrons.