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How many in nature are chemical elements?
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Why do elements react?
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What are noble gases?
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What is a chemical element?
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What is the smallest particle?
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How much elementary particles are known?
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What makes a atom to share?
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What are the electronic shells?
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What connects atoms?
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What is an ion?
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What are electrons?
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What is a molecule?
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What are the atomic sizes?
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What is the core?
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What is an atom?
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How does pressure change?
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What is pressure?
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What happens during evaporation and condensation?
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When is the melting?
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Water is solid, liquid and gaseous
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What substance has the lowest curing temperature?
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What substance has the highest melting point?
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When does the substance solidify?
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What is a plasma?
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When does the fluid boil?
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