Lesson 3: Atom Structure and Subatomic Particles
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Questions and Answers

What is the main component of the nucleus of an atom?

  • Positively charged particles
  • Protons (correct)
  • Neutrons
  • Electrons

Which subatomic particles are found in the electron cloud of an atom?

  • Positively charged particles
  • Neutrons
  • Protons
  • Electrons (correct)

What is the relationship between atomic number, protons, and electrons in an atom?

  • Atomic number = neutrons + protons
  • Atomic number = neutrons + electrons
  • Atomic number = protons - neutrons
  • Atomic number = protons = electrons (correct)

How can atomic mass be calculated based on the components of an atom?

<p>Number of protons + number of neutrons (A)</p> Signup and view all the answers

What term is used for atoms of the same element that have different atomic masses?

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

Who developed the Law of Triads, grouping elements into threes?

<p>Johann Wolfgang Dobereiner (C)</p> Signup and view all the answers

What is the main factor used by Newland in his Law of Octaves to arrange elements?

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

Which group of elements is characterized by having 1 valence electron and increasing reactivity down the group?

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

What is a common property of metalloids?

<p>Poor electrical conductivity (A)</p> Signup and view all the answers

Which type of ions have a positive charge?

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

What is the defining characteristic of noble gases?

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

What is the main focus when counting the number of electrons in ions?

<p>Number of electrons (A)</p> Signup and view all the answers

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