Unit 4 & 5 Review

Henry Moseley's periodic table was an improvement to the periodic table designed by earlier scientists because Moseley's table —

• ordered elements by atomic mass

• ordered elements by atomic number

• was arranged to show the periodicity of chemical properties

• was arranged to show the increase of ionic size

Which of the following best explains why Mendeleev's periodic table was organized according to atomic mass rather than atomic number?

• Atomic number had not yet been discovered.

• Atomic mass is unaffected by chemical reactions.

• Atomic number is more closely related to reactivity.

• Atomic mass varies among the isotopes of an element.

Using his periodic table, Mendeleev was able to —

• discover new elements

• explain the periodicity of unknown elements

• create artificial elements

• predict the properties of unknown elements

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When the noble gases were first discovered, argon was placed with the noble gases in Mendeleev's periodic table, and potassium was placed with the alkali metals. How did this contradict Mendeleev's overall principle behind the organization of his periodic table?

• Argon has a higher atomic mass than potassium.

• Potassium has a higher atomic number than argon.

• Argon has similar physical properties with the other noble gases.

• Potassium has similar chemical properties with the other alkali metals.

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Mendeleev organized his periodic table in order of increasing atomic —

• mass

• number

• radius

• stability

Moseley's research suggested that elements should be sorted by increasing atomic —

• mass

• number

• radius

• stability

The diagram shows part of Dmitri Mendeleev’s original periodic table, with symbols of known elements and their atomic masses. Mendeleev’s arrangement of elements is different than that of the modern periodic table. Based on Mendeleev’s arrangement, which elements should be placed in the shaded boxes labeled X and Z respectively?

• Indium (In), because it has a slightly higher atomic mass than aluminum (Al), and tin (Sn), because it has a slightly higher atomic mass than silicon (Si)

• Cadmium (Cd), because it has chemical properties similar to those of zinc (Zn), and mercury (Hg), because it has chemical properties similar to those of arsenic (As)

• Antimony (Sb), because it has a slightly higher atomic mass than zinc (Zn), and bismuth (Bi), because it also has a higher atomic mass than zinc (Zn)

• Gallium (Ga), because it has chemical properties similar to those of aluminum (Al), and germanium (Ge) because it has chemical properties similar to those of silicon (Si)

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Classify the following as either a metal, metalloid or a nonmetal: Si

• metalloid

• metal

• non-metal

Classify the following as either a metal, metalloid or a nonmetal:

1. Si

2. Na

3. Al

• 1: Metal 2: Non-metal 3: Metal

• 1: Metal 2: Metal 3: Metalloid

• 1: Metalloid 2: Metal 3:Metal

• 1:Non-metal 2: Non-metal 3: Non-Metal

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An element is a solid at room temperature, has luster, is conductive and malleable. During experimentation, it is found to have various ionic forms sometimes possessing a 2+ charge and others a 3+ charge. This element is most likely found in which area of the periodic table?

• Alkali metal family

• Alkaline earth metal family

• Transition metals

• Halogen family

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