Chemistry: Atomic Structure and Periodic Table

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Questions and Answers

What is the atomic number of an element?

  • The number of electrons in an atom's nucleus
  • The number of protons in an atom's nucleus (correct)
  • The total number of protons and neutrons in an atom
  • The sum of protons and neutrons in an atom's nucleus

Which subatomic particle carries a positive charge and determines the atom's identity?

  • Electron
  • Meson
  • Neutron
  • Proton (correct)

What does the mass number of an atom represent?

  • The sum of protons and neutrons in an atom's nucleus (correct)
  • The number of electrons in an atom's nucleus
  • The total number of protons and neutrons in an atom
  • The number of protons in an atom's nucleus

What are isotopes?

<p>Atoms of the same element with different numbers of neutrons (A)</p> Signup and view all the answers

What is the role of neutrons in an atom's nucleus?

<p>Stabilize the nucleus and affect the atom's mass (C)</p> Signup and view all the answers

What is the mass and charge of a neutron?

<p>Mass = 1 amu, Charge = 0 (neutral) (B)</p> Signup and view all the answers

What term is used to describe atoms of the same element with a different number of neutrons?

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

What is the average relative atomic mass (Ar) of chlorine given the following isotopic abundances: Cl-35 (75%) and Cl-37 (25%)?

<p>35.5 (B)</p> Signup and view all the answers

Which particle does not have any charge?

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

What effect do neutrons have on the physical properties of an element?

<p>They affect only the mass and physical properties of the element (D)</p> Signup and view all the answers

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