16. Which of the following is compound? a. Iron b. Nickel c. Salt d. Hydrogen 17. Metals are good conductor of heat and electricity. Which element does NOT exhibit this property? a. Aluminum b. Chromium c. Sulfur d. Tungsten 18. Which of the following is NOT a compound? a. Water b. Sugar c. Carbon dioxide d. Cobalt 19. Periodic table is arranged according to: a. Alphabetical arrangement
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16. Salt- NaCl (Sodium, Chlorine).
17. Tungsten- It is a poor conductor
18. Cobalt- It is an element (Co)
19. Valency of elements
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16)Salt is a compound
17)Tungsten
18) Cobalt is not a compound
19)Atomic Number
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