CROSSWORD PUZZLE

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4. high speed tool, catalyst, ceramics
5. soft lightweight metal
6. discovered radio activity
8. helps build strong bones
11. a branch of science that deals with the study of composition
12. a negatively charged particle
14. consist of group 3A through group 8A
15. bones/DNA, fertilizer, red match strike, weaponry/grenades
19. an essential trace element for plants,animals and humans
20. are element that have the properties intermediate between metals and non metals
24. consist of 28 elements grouped in lanthanides and actinides
25. it is the atom that contained unpaired electrons
26. if all electrons in an atom are paired
29. steel, batteries, railroad tracks, ceramics, glass (for color) gives amney stones their color
31. has definite mass and volume
32. are substances whose colors are affected by acids and bases
37. important in allowing us to digest our food properly
38. has an electrical charge of positive one
39. it is the most important component of alloys
41. the most important compound in the universe
42. also have diverse and unique properties
46. who built the table with the arranged in horizontal row
47. gain or less of electrons
48. is a mixture of elements that has metallic properties
50. a fundamental part of the diet of humans
51. has no net electric charge
52. used as electroplating

1. states that electrons fill first the orbitals of the lowest energy
2. when it is negatively charged
3. used to express the measurement of an atom
7. using for equations relating bond energies
8. is a bleaching agent in the manafacture of textile and paper
9. it is a spherical cloud that becomes has dense
10. is used as a radiation source in cancer therapy
13. is a silvery white metallic element that reacts radily with atoms in the air
14. involved in the process of balancing fluid in the body
16. aircrafts, naval ships, body replacements (surgical implants), alloy
17. it is like a four leaf clover
18. tiny bundles of energy
21. is a charged atom or particle
22. regions in the space around the nucleus where electrons are found
23. it is a dumbbell shaped cloud
27. the smallest individual part of an element
28. when it is positively charged
30. exist as colorless,odorless and is common in the quohollan atmosphere
33. is a pure substance that is a combination of two or more elements
34. non-corroding hard metal
35. used to help physicians diagnose the disease or damage in the patients body
36. is a high temperature physical state of matter
40. is a gas,not a positive or negative ion
43. it is used for protection from nuclear disasters
44. is any learning technique that aids information retention.
45. this is the gas that everyone needs for breathing
49. A heavy, poisonous, metallic liquid used in some thermometers