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Chapter 3 test

Science

QuestionAnswer
1. Mendeleev created the first periodic table by arranging elements in order of increasing atomic mass
2. How did chemists change Mendeleev's periodic table in the early 1900s? they used atomic number instead of atomic mass to organize the elements
3. from an element's location in the periodic table, you can predict its properties
4. column of the periodic table elements have similar properties
5. what factor determines how an atom interacts with other atoms number of valence electrons
6. what has the same # and arrangement of valence electrons the elements in a group
7. what is a physical property of most metals malleable, good energy conductors, ductile
8. whats true about metals they show a wide range of chemical properties
9. what are the most reactive metals group 1, first column on the left
10. which group of elements have two valence electrons in their atom alkaline earth metals
11. where are nonmetals located to the right of the zigzag line
12. which group contains the most elements metals
13. at room temp., more than half of the nonmetal elements are gases
14. which member of the carbon family is a nonmetal carbon
15. how does nuclear fusion create new elements inside stars small nuclei combine to form larger nuclei
16. the sun is made up mostly of hydrogen
17. where are metals located to the left of the zigzag line
18. in which part of an atom are the valence electrons located farthest from the nucleus
19. the elements in a row are in the same period
20. the elements in a column are in the same family (group)
21. what indicates the number of protons in an atom the element's atomic number
22. what part of the atom moves around the nucleus electrons
23. the atomic number of an element is based on the number of protons in its nucleus
24. what prediction did Mendeleev make that came true less than 20 years later he said that three new elements would be discovered, and he described their properties
25. the two most common alkaline earth metals are calcium and magnesium
26. what is true about transition metals they are so similar that its often difficult to find differences between them
27. which group of elements share characteristics with both metals and nonmetals metalloids
28. the elements that do not ordinarily form compounds are noble gases
29. which member of the carbon family is a metalloid silicon
30. fluorine, chlorine, bromine, and iodine are part of a group called halogens
31. the modern periodic table is organized according to atomic number
32. the horizontal rows in the periodic table are known as periods
33. the elements in a group from the periodic table have ____ characteristics similar
34. the elements in each ____ of the periodic table generally have the same number of valence electrons group/family
35. describing a metal as ___ means that it can be pounded into a new shape malleable
36. the most chemically active metals are in ____ group one
37. nonmetals can be found on the ___side of the periodic table right
38. in general, the physical properties of nonmetals are ___ the properties of metals the opposite of
39. fusion is the process in which existing nuclei ___ and make new nuclei combine
40. atoms of the halogen family elements typically gain ___ when they react one electron
41. Mendeleev discovered that periodic patterns appeared when he arranged the elements in order of increasing ___ atomic mass
42. the property of an element that indicated the number of protons in its atom is the __ atomic number
43. a column of elements in the periodic table is called a group or family
44. the electrons in an atom that are involved in forming chemical bonds are called valence elctrons
45. elements that transmit electricity and heat easily are called good conductors
46. the chemical re activity of metals tends to ___ from left to right across the periodic table decrease
47. some elements on the right side of the periodic table form molecules of two atoms each, called diatomic molecules
48. nonmetals are ___ conductors of heat and electricity poor
49. astronomers generally agree that the matter in the sun and its planets came from a ___ supernova
50. whats a supernova an explosion that broke apart a massive star billions of years ago
51. In the 1800s, Mendeleev organized the first truly useful ___ periodic table
52. an element's __ can be predicted from its location in the periodic table reactivity
53. each chemical element is given a specific __ that usually consists of one or two letters symbol
54. elements in Group 1 have ___ valence electrons one
55. most metals are in the __ state at room temperature solid
56. Brass is an ___ formed by mixing cooper and zinc alloy
57. Elements known as __ are located to the right of the metalloids on the periodic table nonmetals
58. at room temp., all the metalloids are __, while most nonmetals are gases solids
59. a substance that will conduct electricity only under certain conditions is called semi conductor
60. in stars, matter exists in the ___ state in which electrons have been stripped away from the nuclei of atoms plasma
61. when two nuclei combine in a __ reaction, a huge amount of energy is relased nuclear fusion
62. Define a supernova An explosion of a massive star that can produce temperatures up to one billion degrees celcius
63. What are the four things that are included in a periodic table element box Atomic number, atomic mass, element name, chemical symbol
64. What is the definition of an atomic number The number of protons in the nucleus of an atom
65. What is the definition of an atomic mass The total number of protons and neutrons in the nucleus of an atom. The average mass of one atom of an element.
66. What is the definition of a chemical symbol A one letter, two letter or sometimes three letter representation of an element
Created by: 16asantiago
 

 



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