Chemistry Chapter 6 Quiz

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Questions and Answers

What does the Aufbau Principle state about electrons in orbitals?

  • Electrons fill higher energy orbitals before lower ones.
  • Electrons must pair up in an orbital before filling another.
  • Electrons fill orbitals in order of increasing energy. (correct)
  • Electrons occupy orbitals randomly.

Which of the following correctly describes Pauli Exclusion Principle?

  • All electrons in an atom must have different energy levels.
  • No more than two electrons can occupy the same orbital with opposite spins. (correct)
  • One electron can occupy multiple orbitals at the same time.
  • Two electrons in one orbital must have the same spin.

According to Hund's Rule, how should electrons be placed in equal energy orbitals?

  • Electrons must occupy all orbitals first before pairing. (correct)
  • Electrons fill the lowest energy orbital first, then double up.
  • Electrons can be placed in any orbital irrespective of energy levels.
  • All orbitals must be filled before any orbital is doubled.

Which of the following is true for an atom's atomic number?

<p>It indicates the number of protons in the nucleus. (A)</p> Signup and view all the answers

How is the complete electron configuration of Helium represented?

<p>[He] 1s2 (D)</p> Signup and view all the answers

Which group on the periodic table contains the most reactive elements?

<p>Halogens (B)</p> Signup and view all the answers

What is the maximum number of electrons that can occupy a set of p orbitals?

<p>6 (C)</p> Signup and view all the answers

Which principle states that no two electrons in an atom can have the same set of quantum numbers?

<p>Pauli exclusion principle (D)</p> Signup and view all the answers

What major change did Mosley contribute to the periodic table?

<p>Introduced atomic number as the organizing principle (D)</p> Signup and view all the answers

Which statement about the octet rule is correct?

<p>Stable atoms typically have 8 valence electrons in their outer shell. (A)</p> Signup and view all the answers

Flashcards

Valence Electrons

The outermost shell of an atom that contains electrons involved in chemical bonding.

Octet Rule

A rule stating that atoms tend to gain, lose, or share electrons to achieve a stable configuration of eight valence electrons.

Groups (Columns)

Elements in the same vertical column of the periodic table, sharing similar chemical properties due to having the same number of valence electrons.

Periods (Rows)

Elements in the same horizontal row of the periodic table, having the same number of electron shells.

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Periodic Law

The arrangement of elements in the periodic table based on their atomic number, reflecting their recurring chemical properties.

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Aufbau Principle

The idea that an electron will occupy the lowest available energy orbital before moving to higher energy orbitals

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Pauli Exclusion Principle

A rule stating that each orbital can hold a maximum of two electrons, with opposite spins.

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Hund's Rule

A rule stating that electrons will individually occupy all empty orbitals within a subshell before pairing up in any one orbital.

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Period

The number of energy levels an atom has, defining its row on the periodic table.

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Periodicity

Repeating patterns of chemical properties observed across the periodic table.

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