Atomic Structure Quiz

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Questions and Answers

What does the atomic number indicate about an atom?

  • The number of electrons in a neutral atom
  • The total mass of the atom
  • The number of protons in an atom (correct)
  • The total number of neutrons

What occurs when the number of protons in an atom is changed?

  • The mass number decreases
  • The atom remains the same element
  • A new element is created (correct)
  • The atom becomes an ion

If an atom has 8 protons and has a -2 charge, how many electrons does it have?

  • 10 electrons (correct)
  • 8 electrons
  • 12 electrons
  • 6 electrons

Which of the following represents the full electron configuration of iodine?

<p>1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁵ (A)</p> Signup and view all the answers

What type of particle results from the loss of electrons in an atom?

<p>Cation (D)</p> Signup and view all the answers

What is the electron configuration of zinc using the noble gas shortcut?

<p>[Ar] 4s²3d¹⁰ (D)</p> Signup and view all the answers

Which energy levels do electrons fill first and why?

<p>They fill the lowest energy levels first for stability (B)</p> Signup and view all the answers

What happens to the mass number if neutrons in an atom are altered?

<p>Mass number is increased but the atom remains the same element (D)</p> Signup and view all the answers

Flashcards

What does atomic number tell you?

The number of protons in an atom's nucleus. It determines the element's identity.

What is the atomic number the same as?

The number of protons in an atom's nucleus.

What is an ion?

Atoms that have gained (anions) or lost (cations) electrons, resulting in a net charge.

What is a mass number?

The sum of protons and neutrons in an atom's nucleus.

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What are valence electrons?

Electrons in the outermost energy level of an atom, involved in chemical bonding.

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What is Aufbau principle?

The principle that electrons occupy the lowest energy levels and subshells first.

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What is an electron configuration?

A representation of the distribution of electrons among energy levels and subshells in an atom.

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What is a noble gas configuration?

A shortened form of electron configuration using the previous noble gas element's configuration as a starting point.

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