Ch.2 Atoms and the Periodic Table
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Problem 5
Locate aluminum in the periodic table and give its group number and period number.Problem 28
Use the following blank periodic table to show where the elements matching the following descriptions appear.
a. Elements with the valence-shell electron configuration ns^2 np^5 b. An element whose third shell contains two p electrons c. Elements with a completely filled valence shell
Problem 30
Use the following orbital-filling diagram to show the electron configuration for As:Problem 40
Where within an atom are the three types of subatomic particles located?Problem 51
Glucose, a form of sugar, has the formula C₆H₁₂O₆. Which elements are included in this compound, and how many atoms of each are present?Problem 51
Why does the fourth period in the periodic table contain 18 elements?Problem 52
Write the formula for ibuprofen: 13 carbons, 18 hydrogens, and 2 oxygens. What are the common uses of ibuprofen?Problem 55
Answer the following questions for the elements from cerium through lutetium: a. Are they metals or nonmetals? b. To what general class of elements do they belong? c. What subshell is being filled by electrons in these elements?Problem 65
What is the total number of orbitals in the third shell? The fourth shell?Problem 66
How many subshells are there in the third shell? The fourth shell? The fifth shell?Problem 70
Use arrows to show electron pairing in the valence p subshell of a. Sulfur b. Bromine c. SiliconProblem 86
An unidentified element is found to have an electron configuration by shell of 2 8 18 8 2. To what group and period does this element belong? Is the element a metal or a nonmetal? How many protons does an atom of the element have? What is the name of the element? Write its electron-dot symbol.Problem 90
What is wrong with the following electron configurations? a. Ni 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 b. N 1s^2 2p^5 c. Si 1s^2 2s^2 2p d. Mg 1s^2 2s^2 2p^6 3sProblem 98
Look again at the trends illustrated in Figures 2.3 and 2.4. a. How do the peaks/valleys correlate with locations in the periodic table? b. Are there other chemical properties that also exhibit periodic trends? What are they?
