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Across 3. This is a source of oxygen in submarines. HINT: it is in equation form. 4. _______ is a source of Potassium. 6. An ionic ______ is when an alkali metal reacts with halogens. 8. Sodium ________ is a major component of seawater. 12. Alkali metals form ____ with a 1+ charge. 15. Alkali metals have ___ melting points. 16. Potassium ions are the main _______ inside cells. 18. Streetlights glow in part comes from the sealed tubes of sodium-_______ alloy inside the light. 19. Quartz crystal is not used for modern communication and navigation systems because of a lack of ________. 20. The first ionization energy's very low level causes ______ to be used in photocells. 21. Alkali metals have an electron ____________ that ends in ns1.

Down 1. Alkali metals are uncombined naturally because they are ______ reactive. 2. Alkali metals are ____ because they have one valence electron. 4. An alkaline ________ is when an alkaline metal reacts with water. 5. Lithium hydride is an easy source for ________. 7. Alkali metal's atoms are the _______ in their periods. 8. This causes baked goods to rise. HINT: parenthesis are included in spaces provided. 9. Sodium is largely produced by the ____________ of molten sodium chloride 10. This is what potassium superoxide removes from the atmosphere as it produces oxygen. HINT: it is in equation form. 11. Lithium ions most likely have an effect on the ____________ of messages between brain cells. 13. Alkali metals are ______-gray metals. 14. Even when the supply is low, your kidneys still excrete _________. So eat your bananas! 17. Sailors depended on ____ in order to stay fed on their long voyages away from fresh food sources. HINT: it is in equation form.