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Chapter 3: Atomic Structure

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The maximum number of electrons in the second shell is:

A 2 B 4 C 6 D 8

Which model replaced the idea of fixed electron paths?

A Bohr model B Dalton model C Quantum mechanical model D Rutherford model

The outermost shell of an atom is called:

A K shell B Valence shell C L shell D Nucleus

Paula is studying isotopes of chlorine. Chlorine has two common isotopes: chlorine-35 and chlorine-37. What is the difference between them?

A Chlorine-37 has 2 more protons B Chlorine-37 has 2 more electrons C Chlorine-37 has 2 more neutrons D Chlorine-37 has 2 fewer neutrons

Rania is studying relative atomic mass. She learns that it is the weighted average mass of an atom compared to 1/12th of carbon-12. What unit is used for relative atomic mass?

A Grams B Atomic mass unit (amu) C Kilograms D Moles

Emma is learning about the quantum mechanical model of the atom. Her teacher explains that it is the most accurate model. What is a key feature of the quantum mechanical model?

A It describes electrons in terms of probability clouds or orbitals B It shows electrons moving in fixed circular paths C It says the nucleus is made of only protons D It ignores the wave nature of electrons

Omar is studying isotopes of hydrogen. He learns that hydrogen has three isotopes: protium, deuterium, and tritium. How do these isotopes differ?

A They have different numbers of protons B They have different numbers of neutrons C They have different numbers of electrons D They have different numbers of nuclei

Mass number is the total number of:

A Electrons and protons B Protons only C Protons and neutrons D Neutrons only

Which subatomic particle has a negative charge?

A Proton B Neutron C Electron D Nucleus

Vera is studying shells and sub-shells. She learns that the second shell (n=2) has two sub-shells: s and p. How many electrons can the p sub-shell hold?

A 2 B 6 C 10 D 14

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