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2.2.3: A Brief History of the Organization of the Periodic Table (Problems)

  • Page ID
    210631
  • PROBLEM \(\PageIndex{1}\)

    Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group element, transition metal, or inner transition metal:

    a. uranium
    b. bromine
    c. strontium
    d. neon
    e. gold
    f. americium
    g. rhodium
    h. sulfur
    i. carbon
    j. potassium

    Answer a

    metal; inner transition metal

    Answer b

    nonmetal, main group element

    Answer c

    metal, main group element

    Answer d

    nonmetal, main group element

    Answer e

    metal, transition metal

    Answer f

    metal, inner transition metal

    Answer g

    metal, transition metal

    Answer h

    nonmetal, main group element

    Answer i

    nonmetal, main group element

    Answer j

    metal, main group element

    PROBLEM \(\PageIndex{2}\)

    Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal:

    a. cobalt
    b. europium
    c. iodine
    d. indium
    e. lithium
    f. oxygen
    g. cadmium
    h. terbium
    i. rhenium

    Answer a

    metal, transition metal

    Answer b

    metal, inner transition metal

    Answer c

    nonmetal, main group element

    Answer d

    metal, main group element

    Answer e

    metal, main group element

    Answer f

    nonmetal, main group element

    Answer g

    metal, transition metal

    Answer h

    metal, inner transition metal

    Answer i

    metal, transition metal

    PROBLEM \(\PageIndex{3}\)

    Using the periodic table, identify the lightest member of each of the following groups:

    a. noble gases
    b. alkaline earth metals
    c. alkali metals
    d. chalcogens

    Answer a

    He

    Answer b

    Be

    Answer c

    Li

    Answer d

    O

    PROBLEM \(\PageIndex{4}\)

    Using the periodic table, identify the heaviest member of each of the following groups:

    a. alkali metals
    b. chalcogens
    c. noble gases
    d. alkaline earth metals

    Answer a

    Fr

    Answer b

    Po

    Answer c

    Rn

    Answer d

    Ra

    PROBLEM \(\PageIndex{5}\)

    Use the periodic table to give the name and symbol for each of the following elements:

    (a) the noble gas in the same period as germanium
    (b) the alkaline earth metal in the same period as selenium
    (c) the halogen in the same period as lithium
    (d) the chalcogen in the same period as cadmium

    Answer a

    Kr; Krypton

    Answer b

    Ca; Calcium

    Answer c

    F; Fluorine

    Answer d

    Te; Tellurium

    PROBLEM \(\PageIndex{6}\)

    Use the periodic table to give the name and symbol for each of the following elements:

    (a) the halogen in the same period as the alkali metal with 11 protons
    (b) the alkaline earth metal in the same period with the neutral noble gas with 18 electrons
    (c) the noble gas in the same row as an isotope with 30 neutrons and 25 protons
    (d) the noble gas in the same period as gold

    Answer a

    Cl; Chlorine

    Answer b

    Mg; Magnesium

    Answer c

    Kr; Krypton

    Answer d

    Rn; Radon

    PROBLEM \(\PageIndex{7}\)

    Write a symbol for each of the following neutral isotopes. Include the atomic number and mass number for each.

    (a) the alkali metal with 11 protons and a mass number of 23
    (b) the noble gas element with and 75 neutrons in its nucleus and 54 electrons in the neutral atom
    (c) the isotope with 33 protons and 40 neutrons in its nucleus
    (d) the alkaline earth metal with 88 electrons and 138 neutrons

    Answer a

    \(\ce{^{23}_{11}Na}\)

    Answer b

    \(\ce{^{129}_{54}Xe}\)

    Answer c

    \(\ce{^{73}_{33}As}\)

    Answer d

    \(\ce{^{226}_{88}Ra}\)

    PROBLEM \(\PageIndex{8}\)

    Write a symbol for each of the following neutral isotopes. Include the atomic number and mass number for each.

    1. the chalcogen with a mass number of 125
    2. the halogen whose longest-lived isotope is radioactive
    3. the noble gas, used in lighting, with 10 electrons and 10 neutrons
    4. the lightest alkali metal with three neutrons
    Answer a

    \(\ce{^{125}_52Te}\)

    Answer b

    \(\ce{^{210}_85At}\)

    Answer c

    \(\ce{^{20}_10Ne}\)

    Answer d

    \(\ce{^{6}_3Li}\)

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