2. Chapter: The Periodic Table Table of Contents Section 3: Transition Elements Section 1: Introduction to the Periodic Table Section 2: Representative Elements
26. 1 Section Check Question 1 Horizontal rows in the periodic table are known as _______. A. lines B. periods C. tables D. walls NC: 4.03
27. 1 Section Check Answer NC: 4.03 The answer is B. Atomic number increases across a period.
28. 1 Section Check Question 2 In 1869, this famous scientist invented the first version of the periodic table of elements, though there have been many changes since his day. NC: 4.03
29. 1 Section Check Answer The scientist was Dmitri Mendeleev. Though his name may not be as familiar to you as Isaac Newton or Albert Einstein, Mendeleev is arguably as important a figure in the history of science. NC: 4.03
30. 1 Section Check Question 3 What is the particular name given to groups 3 through 12 on the periodic table? Answer These groups are known as the transition elements. On either side of them are the representative elements. NC: 4.03
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61. 2 Section Check Question 1 What does the term “halogen” mean? NC: 4.03
62. 2 Section Check Answer Halogen means “salt-former.” All the halogens form salts with sodium (and other alkali metals). NC: 4.03
63. 2 Section Check Question 2 Why is it important to have a layer of ozone in our upper atmosphere? Answer Ozone shields us from dangerous forms of radiation that come from the Sun. NC: 4.08
64. 2 Section Check Question 3 Almost 80% of the air you are breathe consists of _______. A. oxygen B. nitrogen C. halothane D. argon NC: 4.03
65. 2 Section Check Answer The answer is B. Most people think they are just breathing oxygen, but in fact they are mostly breathing in nitrogen! NC: 4.03
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82. Section Check 3 Which three elements are known as “the iron triad”? Question 1 The iron triad consists of iron, cobalt, and nickel. They are called this because of their similar properties. Answer NC: 4.03
83. Section Check 3 Which group consists of ruthenium, rhodium, palladium, osmium, iridium, and platinum? Question 2 The answer is the platinum group. These elements all have similar properties, which is why they are grouped together. Answer NC: 4.03
84. Section Check 3 What is most notable about the nuclei of the actinides? Question 3 The nuclei of actinides are unstable. All the actinides are radioactive, which means they decay to form other elements. Answer NC: 4.03
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