CROSSWORD

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Across

4. I Am So Unstable That I Am Used For Scientific Research

5. Sometimes I Show Up In Swimming Pool

8. I Can Easily Catch Fire Even When In Contact With Air

10. I Am Never Alone In Nature

Down

1. Sometimes I Filled In Bulb

2. Used To Burn In Air With A Bright White Light

3. I Don't React With Nitrogen & Water but Dissolve Slowly In H2SO4

6. I Am Important For Bone Health

7. Used In Medicine To Treat Mental Disorder

9. I React With Very Hot Water & Steam To Produce Hydrogen

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