Which of the following are used in the production of smartphones? Select the three correct a answers. Calcite, lithium, silicon, colbalt, alunite, or halite

silicon, cobalt

Explanation:

For the production of mobile phones following are made use of Alumina, Silica, Graphite, Manganese, Aluminium. Of which 25% constitutes the silicon, 23 % plastic, 20.4% iron, and aluminum 14.17 %. Other elements include copper, gold, silver, lithium, and cobalt also. Thus about 83 stable elements make the smartphone.

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

Answer is to avoid experimental error