f. what states of matter do halogens exist in at room temperature? 19. click on noble gases (left bar) and…

f. what states of matter do halogens exist in at room temperature? 19. click on noble gases (left bar) and answer these questions. a. what is the group number? b. why were these gases considered to be inert or stable? c. what is their oxidation number? 20. click on rare earth elements (inner transition) (left bar) and answer these questions. a. on you periodic table, label the lanthanide and actinide series with your pencil. b. how many rare earth elements are there? c. define trans - uranium. d. the rare earth metals are found in group and periods and. part iv: “periodic trends” the periodic table is called such because many properties are periodic functions of their elements. in this section you will define each of the periodic properties and describe how the properties vary across a row and down a column of the periodic table. go to: http://chemistry.about.com/od/periodictableelements/a/periodictrends.htm • atomic radii • ionic radii • cation • anion • ionization energy • electron affinity • electronegativity • metallic character part v: “representations of the periodic table” as you search the sites below, be aware of the different portrayals of the periodic table. what are the different tables illustrating? which do you like best?

f. what states of matter do halogens exist in at room temperature? 19. click on noble gases (left bar) and answer these questions. a. what is the group number? b. why were these gases considered to be inert or stable? c. what is their oxidation number? 20. click on rare earth elements (inner transition) (left bar) and answer these questions. a. on you periodic table, label the lanthanide and actinide series with your pencil. b. how many rare earth elements are there? c. define trans - uranium. d. the rare earth metals are found in group and periods and. part iv: “periodic trends” the periodic table is called such because many properties are periodic functions of their elements. in this section you will define each of the periodic properties and describe how the properties vary across a row and down a column of the periodic table. go to: http://chemistry.about.com/od/periodictableelements/a/periodictrends.htm • atomic radii • ionic radii • cation • anion • ionization energy • electron affinity • electronegativity • metallic character part v: “representations of the periodic table” as you search the sites below, be aware of the different portrayals of the periodic table. what are the different tables illustrating? which do you like best?

Answer

Brief Explanations:

f. Halogens at room - temperature exist in different states: fluorine and chlorine are gases, bromine is a liquid, and iodine is a solid. 19a. Noble gases are in group 18. 19b. Noble gases have a full outer - electron shell, which makes them stable and inert as they have little tendency to gain, lose, or share electrons. 19c. The oxidation number of noble gases is usually 0, as they are chemically unreactive and have a stable electron configuration. 20a. The Lanthanide series is in period 6, elements 57 - 71; the Actinide series is in period 7, elements 89 - 103. 20b. There are 17 Rare Earth elements. 20c. Trans - uranium elements are elements with atomic numbers greater than 92 (uranium). 20d. Rare Earth metals are found in group 3 and periods 6 and 7.

Answer:

f. Fluorine and chlorine are gases, bromine is a liquid, iodine is a solid. 19a. 18 19b. They have a full outer - electron shell. 19c. 0 20a. Lanthanide series: period 6, elements 57 - 71; Actinide series: period 7, elements 89 - 103 20b. 17 20c. Elements with atomic numbers greater than 92. 20d. 3; 6; 7