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Fill in the blanks :1. The smallest particle of matter that can exist by itself ______ 2. A compound containing one atom of carbon and two atoms of oxygen is ______ 3. ______ is the only non-metal conducts electricity. 4. Elements are made up of ______ kinds of atoms. 5. ______of some elements are derived from Latin or Greek names of the elements. 6. There are ______ number of known elements. 7. Elements are the ______ form of pure substances. 8. The first letter of an element always written in ______ letter. 9. Molecule containing more than three atoms are known as ______10. ______ is the most abundant gas in the atmosphere. |
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Answer» 1. atom 2. CO2 3. Graphite 4. same 5. Symbol 6. 118 7. simplest 8. capital 9. polyatomic molecule 10. Nitrogen |
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