Probably Lead or Tin for the solder. There is copper and small amounts of other metals for conductors. Semiconductors mostly silicon in the chips themselves. The boards are compounds and are not likely to have anything close to elemental form of materials.
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no, it is most commonly found as a compound
hydrogen is most commonly found as a part of water with oxygen.
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No. If you burn an element, you will turn it into a compound (most commonly [element burnt] oxide). Which will not be an element.
Oxygen, hydrogen, halogens
Sulfur is most commonly referred as a foul smelling element.
binary and hexadecimal
Very probable this element is oxygen.
Oxygen, hydrogen, halogens
Polonium doesn't contain another element.
Polonium doesn't contain another element.