HS-PS1-1 Aero Standard: Atomic Structure and Periodic Table
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Questions and Answers

What is the smallest unit of an element that retains its chemical properties?

  • Neutron
  • Proton
  • Nucleus
  • Atom (correct)

    • Which subatomic particle contributes to the atom's identity and determines its atomic number?

  • Proton (correct)
  • Electron
  • Neutron
  • Nucleus

    • What does the mass number of an atom represent?

  • Number of neutrons
  • Number of protons
  • Atom's mass but not its identity (correct)
  • Number of electrons

    • What is defined as the number of protons in an atom's nucleus, unique to each element?

    <p>Atomic number</p> Signup and view all the answers

    What are atoms of the same element with different numbers of neutrons called?

    <p>Isotopes</p> Signup and view all the answers

    What is the central core of an atom containing protons and neutrons, and carries a positive charge due to the presence of protons?

    <p>Proton</p> Signup and view all the answers

    What are the distinct regions around the nucleus where electrons are likely to be found called?

    <p>Energy levels</p> Signup and view all the answers

    What is the mass and charge of a neutron?

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

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

    <p>They affect only the mass, not the physical properties</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</p> Signup and view all the answers

    How is the 'relative' atomic mass of an element standardized?

    <p>By taking an average across all the isotopes of the element</p> Signup and view all the answers

    What is used to calculate the 'relative' atomic mass (Ar) of isotopes?

    <p>% Abundance in nature</p> Signup and view all the answers

    What determines which isotope's mass should be used on the periodic table if there are different isotopes of an element?

    <p>The average mass across all isotopes</p> Signup and view all the answers

    What is another name for 'Chlorine-35' and 'Chlorine-37' based on their isotopic composition?

    <p>'Common' chlorine and 'Rare' chlorine</p> Signup and view all the answers

    How many neutrons does each chlorine isotope have?

    <p>$^{35}$Cl: 18, $^{37}$Cl: 17</p> Signup and view all the answers

    What does 'Ar' stand for in chemistry when discussing isotopes?

    <p>Relative atomic mass</p> Signup and view all the answers

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