Chemistry formulas -Periodic t

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In this new version chemistry formulas not only chemistry formulas but all so a complete chemistry app. In this new version, we change the UI in dark blue for your eye protection. In this new version, you can read an article every day in chemistry. It helps you to learn chemistry every day. In this new version you can test your knowledge in chemistry by our weekly online contest. We wish that this new feature helps you lot.
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