1													2
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					10											11
		12		13									14	15
16
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		19
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		21		22
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						24		25
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27										28		29
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					35									36
	37
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Across 4. group of atoms held together by covalent bonds and has no overall charge 7. element that maintains blood volume, pH level and blood pressure 8. element found in hair, nails, and skin 10. element that helps muscle contraction and proper heart beat 11. substance made of atoms of two or more different element that are chemically combined 12. these types of reactions are constantly occurring inside our cells 14. a substance that releases hydrogen ions when dissolved in water 19. building block of nucleic acids 22. element that is absorbed by throid and show activity 26. element needed for strong bones and teeth, blood clotting 27. when the stuff entering the cell equals what is going out 30. element that fights fatigue and production of hemoglobin 31. number of elements essential to living things 32. center of an atom 36. atoms with a different number of neutrons 37. positively charged particle of an atom 38. a substance that releases hydroxide ions when dissolved in water 39. element that filters wastes from kidneys 40. combination of substances that are not chemically combined 41. element that helps make healthy bone and joint functions, converts Vitamin D 42. neutral charged particle of an atom

Down 1. examples of this include fats, oils, glycerols 2. substance that can't be broken down into simpler chemical substances 3. property of water that allows it to absorb a lot of heat without raising the temperature 5. they release energy when broken down and are made of C, H, O 6. smallest part of an element that has the characteristics of that element 9. element that accelerates the renewal of skin cells 13. area around the nucleus where you may find an electron 15. bond formed with atoms share electrons 16. element that is an antioxidant, healing wounds 17. bond formed when two ions with charges are attracted to each other 18. element that is used in sterilization in radiotherapy 20. the part of a solution that is being dissolved 21. net movement of particles from area of high concentration to low concentration 23. atoms are this because protons equal electrons 24. element that prevents anemia and neuromuscular problems 25. building block of proteins 28. all the chemical reactions within an organism 29. negatively charged particle of an atom 33. the part of a solution that is doing the dissolving 34. mixture that has the solute evenly distributed within the solvent 35. element that makes hormones, transports oxygen in the body