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Fill in the blanks : 1. The name copper was taken from ______ 2. The first letter of a symbol of an element is always written as a the second letter as a ______ letter and the second letter as a _____ letter 3. There are ______ hydrogen atoms in water molecule. 4. There is ______ oxygen atom is water molecule. 5. ______ is the total number atoms present in one molecule of an element, compound or a substance. 6. ______ is a mixture of gases 7. ______ is the life-giving element is the air 8. During heating or expansion, the ______ 9. ______ is the smallest particle of an element.10. ______ of an element consist of a fixed number of different types of atom. |
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Answer» 1. cypress 2. capital,small 3. 2 4. 1 5. atomicity 6. Air 7. Oxygen 8. mass 9. Atom 10. Molecules |
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