chemitry

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Across

3. the basic partical of an element is called a(n) ____________

5. the main gas you breath

6. when atoms are combined they will form ______________

7. the gas that makes global warming

8. carbon, oxygen, clasium are ______________ of chemestry

9. made up of elements

Down

1. two or more atoms held together

2. it shows the elements in the compound and the ratio of atoms

4. a substance made of two or more elements

6. makes your bones stronger and grow

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