Ch.2 Atoms and the Periodic Table
Back
- Locate aluminum in the periodic table and give its group number and period number.
Problem 5
- Use the following blank periodic table to show where the elements matching the following descriptions appear.
Problem 28
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
- Use the following orbital-filling diagram to show the electron configuration for As:
Problem 30
- Where within an atom are the three types of subatomic particles located?
Problem 40
- 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 51
- Write the formula for ibuprofen: 13 carbons, 18 hydrogens, and 2 oxygens. What are the common uses of ibuprofen?
Problem 52
- 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 55
- What is the total number of orbitals in the third shell? The fourth shell?
Problem 65
- How many subshells are there in the third shell? The fourth shell? The fifth shell?
Problem 66
- Use arrows to show electron pairing in the valence p subshell of a. Sulfur b. Bromine c. Silicon
Problem 70
- 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 86
- 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 3s
Problem 90
- 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?
Problem 98
