Chemistry Trends I: Atomic Radius
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  • Question 1
    900 seconds
    Q. Trends of the periodic table starts on page 150 of your textbook.
    answer choices
    I understand.
    Choose: I understand
  • Question 2
    900 seconds
    Q. So far, we have learned that the elements are arranged in the periodic table according to their atomic number and that there is a rough correlation between the arrangement of the elements and their electron configuration. We will further explore the trends of the periodic table in this section.
    Why do elements in the same family (or group) generally have similar properties?
    answer choices
    They have the same number of valence electrons, therefore react the same way
    Elements in the same family have different numbers of valence electrons, therefore we do not know how they react.
  • Question 3
    900 seconds
    Q. "Main group" elements are represented by groups 1 and 2, 13-18. We will refer to "main group" elements throughout this unit.
    What is the first element in group 17?
    answer choices
    fluorine
    helium
    carbon
    boron
  • Question 4
    900 seconds
    Q. In chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond. Similar to an electron in an inner shell, a valence electron has the ability to absorb or release energy in the form of a photon. An energy gain can trigger an electron to move (jump) to an outer shell; this is known as atomic excitation.
    Which electrons are involved in chemical bonding?
    answer choices
    valence electrons
    inner core electrons
    protons are involved in chemical bonding
  • Question 5
    900 seconds
    Q. Valence electrons have the ability to absorb or release electrons in the formation of __________.
    answer choices
    photons
    more electrons
    more energy levels
  • Question 6
    900 seconds
    Q. The electrons that determine how an atom reacts chemically are those whose average distance from the nucleus is greatest; that is, those with the highest energy.
    These are the valence electrons-electrons available to be lost, gained, or shared in the formation of chemical compounds.
    Valence electrons are those electrons in the outer energy level. Elements have a maximum of 8 valence electrons.
    For example:
    The electron configuration for C is 1s22s22p2  So the outer energy level "2" has 4 electrons. If you notice C is in "main group" 14. So carbon has 4 valence electrons.
    How many valence electrons does Li have?
    answer choices
    2
    1
    5
    7
  • Question 7
    900 seconds
    Q. How many valence electrons does the element with the electron configuration 1s2 2s2 have?
    answer choices
    1
    2
    4
    8
  • Question 8
    900 seconds
    Q. How many valence electrons does boron have?
    answer choices
    1
    3
    5
  • Question 9
    900 seconds
    Q. How many valence electrons does an element with the electron configuration 1s22s22p4 have?
    answer choices
    6
    4
    8
  • Question 10
    900 seconds
    Q. How many valence electrons does Xe have?
    answer choices
    54
    1
    8
  • Question 11
    900 seconds
    Q. The elements in "main group" 18 have 8 valence electrons. They all have the maximum number (8) electrons in their outer shell.
    In other words the "p" orbital is full. This generally means that the noble gases of group 18 are non-reactive.
    Helium is in group 18. However, He has an electron configuration 1s2. Helium has no other energy levels therefore it has 2 valence electrons and not 8.
    How many valence electrons does Helium have?
    answer choices
    2
    8
    unknown
    18
  • Question 12
    900 seconds
    Q. The atomic radius of a chemical element is  measured as one-half the distance between the nuclei of identical atoms that are bonded together. Electrons do not have definite orbits, or sharply defined ranges. Rather, their positions must be described as probable locations that taper off gradually as one moves away from the nucleus. This size is typically measured in Angstroms (or 10-10 meters)
    Our first trend is a measure of the size of an atom or its _________  _____________.
    answer choices
    atomic radius
    orbits
    electrons
  • Question 13
    900 seconds
    Q. The radii generally decrease along each period (row) of the table, from the alkali metals to the noble gases; and increase down each group (column).
    What is the trend in atomic radius down a group?
    answer choices
    increase in radius
    decrease in radius
    no change in radius
  • Question 14
    900 seconds
    Q. Which of the following elements has the smallest atomic radius: Li, O, C, F?
    answer choices
    Li
    O
    C
    F
  • Question 15
    900 seconds
    Q. Of the elements Ca, Be, Ba, and Sr, which has the largest atomic radius?
    answer choices
    Be
    Ba
    Ca
    Sr
  • Question 16
    900 seconds
    Q. Of the elements Ca, Be, Ba, and Sr, which has the smallest atomic radius?
    answer choices
    Be
    Ba
    Ca
    Sr
  • Question 17
    900 seconds
    Q. Of the elements Al, Mg, Si, Na, which has the smallest atomic radius?
    answer choices
    Al
    Mg
    Si
    Na
  • Question 18
    900 seconds
    Q. Rank the following elements by increasing atomic radius:
    carbon, aluminum, oxygen, phosphorus.
    Not sure? check out page 151 in your textbook
    answer choices
    O, C, P, Al
    Al, P, C, O
    O,P, C, Al
    O, P, Al, C
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