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FREE CHEMISTRY AND STUDY GAMES ABOUT CHEMISTRY
EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -10 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Write the electron configuration for the following:
- Berylium
- Chlorine
- Chromium*
- Iodine
Answer:
1s2 2s2 1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p6 3s2 3p6 4s1 3d5 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5 Question 2: Write the Noble Gas configuration for the following:
- Bromine
- Copper*
- Nickel
Answer:
[Ar] 4s2 3d10 4p5 [Ar] 4s1 3d10 [Ar] 4s2 3d8 Question 3: Summarize the organization of the first three shells of the electron cloud. Include their orbitals and how many total electrons they can hold.
Answer:
1st Shell = 1s2 2nd Shell = 1s2 1p6 3rd Shell = 1s2 1p6 1d10 Question 4: Summarize what starts happening in the fourth period that makes the configuration of electrons more complicated.
Answer:
4s2 has slightly less energy than 3d10 so 4s2 gets filled first.
Question 5: Orbital
Answer:
a 3d region around the nucleus that shos where e- probbly is Question 6: Differentiate between Bohr's model of the atom and the quantum model of the atom.
Answer:
The bohr model said that electrons travel on distinct paths. The quantum model shows that electrons move sporadically throughout the electron cloud.
Question 7: Electron configuration
Answer:
The most stable arrangment of e- in an atom's electron cloud.
Question 8: List and define the four quantum numbers used to describe orbitals
Answer:
s orbital = 2 e- p orbital = 6 e- d orbital = 10 e- f orbital = 14 e-
Question 9: Explain the three laws that determine the electron configuration of an atom.
Answer:
Aufbau principle: e- fill the lowest energy orbital first
Hund's rule: orbitals of equal energy each get 1 e- before any orbital gets a second Pauli Exclusion principle: no two e- in the same atom can have the same set of quantum numbers
Question 10: Quantum theory
Answer:
a mathematical description for the waves properties of e- and other tiny particles.
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