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Help. Please! Help for 6-13
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Help. Please! Help for 6-13

Help. Please! Help for 6-13-example-1
User VPP
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8. Transition metals
9. Halogens
10. Nobel gasses
11. Lanthanides
12. Actinides
13. The tendency of a substance to undergo chemical reaction, either by itself or with other materials, and to release energy.
User MrAnno
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