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Chemistry 101 ………….., Exercises of Chemistry

Drexel UniversityChemistry

Chem 101 it is chem 101 recitation

Typology: Exercises

2024/2025

Uploaded on 11/16/2025

bohoussou-lynn-marie
bohoussou-lynn-marie 🇺🇸

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CHEM 101 – Recitation Week 4
Ch. 3, 9. What is "shielding"? Which electrons tend to do the most shielding in an atom (core
electrons or valence electrons)?
Ch. 3, 10. How does the penetration of an orbital into the region occupied by core electrons
affect the energy of an electron in that orbital?
Ch. 3, 44. Determine whether each element is a transition element.
a. Cr
b. Br
c. Mo
d. Cs
Ch. 3, 46. Write the full electron configuration for each element.
b. P
c. Ar
d. Na
Ch. 3, 50. Use the periodic table to determine the element corresponding to each electron
configuration below.
a. [Ar] 4s2 3d10 4p6
b. [Ar] 4s2 3d2
c. [Kr] 5s2 4d10 5p2
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CHEM 101 – Recitation Week 4

Ch. 3, 9. What is "shielding"? Which electrons tend to do the most shielding in an atom (core electrons or valence electrons)? Ch. 3, 10. How does the penetration of an orbital into the region occupied by core electrons affect the energy of an electron in that orbital? Ch. 3, 44. Determine whether each element is a transition element. a. Cr b. Br c. Mo d. Cs Ch. 3, 46. Write the full electron configuration for each element. b. P c. Ar d. Na Ch. 3, 50. Use the periodic table to determine the element corresponding to each electron configuration below. a. [Ar] 4s^2 3d^10 4p^6 b. [Ar] 4s^2 3d^2 c. [Kr] 5s^2 4d^10 5p^2

d. [Kr] 5s^2 Ch. 3, 52. Use the periodic table to determine each quantity. a. The number of 3s electrons in Mg ______ b. The number of 3d electrons in Cr_______ c. The number of 4d electrons in Y_______ d. The number of 6p electrons in Pb ________ Ch. 3, 54. Name an element in the third period (row) of the periodic table with: a. Three valence electrons ____________________ b. Four 3p electrons __________________ c. Six 3p electrons ________________ d. Two 3s electrons and no 3p electrons ________________ Ch. 3, 60. List the number of valence electrons in each element and classify each element as an alkali metal, alkaline earth metal, halogen, or noble gas. a. F ________________________________________ b. Sr ________________________________________ c. K _________________________________________ d. Ne ________________________________________ e. At _________________________________________ Ch. 3, 64 Predict the charge of the ion formed by each element and write the electron configuration of the ion. a. Mg b. N