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10. Explain what periodicity is in the periodic table of elements.
11. How so you think thermal and electrical conductivity of iron at the Earth's core effects the Earth?
Experiment: Electrolytes or Non-electrolytes
Interactive: Electrical Conductors
12. Explain what a metal alloy is?
Interactive: Periodic Table
Interesting Facts: Metals
13. Why do you think carbon is such an important element?
Illustration: Carbon
Information: Silicon
14. What is the most abundant element in Earth’s crust and accounts for almost a third the planet’s mass?
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