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Across 3. The Mass Number is measured in standard unit called a 8. 6.022 x 10 to the 23rd g 9. Atoms combined in fixed numbers and ratios. 10. is a negativly charged atom. 14. the amount of energy needed to increase the temperature of a given quantity of water or liquid. (2 Words) 19. Change this, change the element. (2 Words) 20. Four Key Elements 22. substances that compensate for pH changes by absorbing or releasing H+. 24. substances that release H+ (Hydrogen ions or protons). 25. the electrons in the outer most energy shell (2 Words) 29. is a positively charged atom 30. the amount of heat energy required to raise 1 g of water by 1◦C. 31. It's logarithmic! Yit Yit! (2 Words) 32. having an aversion to or fear of. 33. Small, fast, negative, (1.66 x 10 to the 24th g) 34. I wanted to make a clever Chemistry joke but the best ones...

Down 1. Carbon-14 2. a pure substance that cannot be broken down into simpler substances. 4. the smallest units of matter that retain the chemical and physical properties of an element. 5. has the same mass as a proton. 6. 6 CO2 + 6 H2O -> C6H12O6 + 6 O2 (2 Words) 7. Not so much a bond more of an attractive force. (3 Words) 11. a proton is. 12. Occupies space and has mass. 13. Calorie 15. type of bond where atoms gain or lose valence electrons completely and become ions that bond. 16. where the protons and neutrons are. (2 Words) 17. composed of two different elements. 18. type of bond when two atoms share a pair of valence electrons. (2 Words) 21. When you add the protons and neutrons. (2 Words) 23. how atoms interact and connect with each other. (2 Words) 26. the space where the electrons are – most of the time. 27. having an affinity or preference for. 28. Type of bond between a partially positively charged H and a partially negatively charged atom 31. When the electrons are not shared equally it becomes