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CEM 141 Exam 3 Practice Questions & 100% Verified Correct Answers with complete solutions (Latest update

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CEM 141 Exam 3 Practice Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
  • 3
  • 2024/2025
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  • cem 141 exam 3 practice

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CEM 141 Exam 3 Practice
Regions of space where electrons with a particular quantized energy are most likely to be found
- ANS-Atomic Orbitals

Electrons occupy lowest level orbitals first - ANS-Aufbau Principle

Electrons don't pair up until they have to - ANS-Hund's Rule

Close to the nucleus - ANS-Core

Higher in energy and far away from the nucleus - ANS-Valence

Represents the state where the FORCES OF ATTRACTION between the electrons and protons
are EQUAL to the FORCES OF REPULSION between the electrons & Increases as you go
DOWN and decreases ACROSS a row - ANS-Atomic Radius

Explains the attractions between the protons and electrons & the repulsions between the
electrons - ANS-Coulomb's Law

Tells you how many protons are attracted to the valence electrons (# of protons - # of core
electrons) & INCREASES as you go across - ANS-Effective Nuclear Charge

"Hold on to their electrons" tightly because the electrons are more strongly attracted to the
nucleus - ANS-Atoms with a high ENC

INCREASES as you go ACROSS (because you need more energy to remove an electron thats
held tightly to the nuclues) & DECREASES as you go DOWN - ANS-Ionization energy

Because there is an exact amount of energy to send an electron out an atom, means they exist
in discrete energy levels - ANS-Why are ionization energies evidence for the quantization of
energy levels in atoms?

Adding 2 nuclei together (as 2 nuclei move toward each other the PE increases because its a
repulsive force between 2 positive charged particles) - ANS-Nuclear fusion

Breaking apart - ANS-Nuclear fission

Nucleus of atom gives off energy - ANS-Nuclear decay

To become as stable as possible - ANS-Why do fusion and fission both release energy?

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