Alternate Periodic Table Test

In the 1860s, Dmitri Mendeleev designed a Periodic Table of elements based on extensive research and observations. He left several gaps in his Periodic Table for elements that had yet to be discovered. A section of a Periodic Table with one such gap is shown above. Which of the following sets of data could match the unknown element?

• Non-metal, Mass: 72

• Metalloid, Mass: 78

• Reactive metal, Mass: 71

• Metalloid, Mass: 74

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William Ramsey was determined to discover new elements. In collaboration with Lord Rayleigh, and building on the work of Henry Cavendish, Ramsey isolated an unknown gas from a sample of air. Further study showed that the unknown gas was inert because it would not react with any known substances. Following the discovery, Ramsey continued to search for inert gases. His work allowed for precise measurement and the placement of all of these gases in the same group on the Periodic Table. Based on the information provided, what group of elements did William Ramsey discover?

• Group 1

• Group 15

• Group 17

• Group 18

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Henry Moseley studied x-ray spectra of several elements in a row of the Periodic Table. He found that each element had one more proton than the element immediately to its left. Which statement best describes Moseley's contribution to the modern Periodic Table?

• Recognizing that elements in the Periodic Table have similar properties

• Grouping elements in the Periodic Table based on their physical properties

• Predicting the properties of missing elements in the Periodic Table

• Providing a basis for ordering elements in the Periodic Table

The best explanation for the organization of Mendeleev's Periodic Table by atomic mass rather than atomic

number is that —

• atomic mass is unrelated to the chemical reactivity of elements

• Mendeleev organized the table prior to the discovery of the atomic number

• different isotopes of elements have different atomic masses

• atomic numbers are not affected by the chemical reactivity of elements

Which of the following describes the properties of noble gases?

• They have high boiling points.

• They are highly reactive.

• They are generally unreactive.

• They are solid at room temperature.

Which family correctly represents the elements in Group 1 on the Periodic Table?

• Transition metals

• Alkali metals

• Lanthanide elements

• Actinide series

As the atomic number on the Periodic Table increases, the number of electrons —

• is unchanged

• alternates

• decreases

• increases

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Some physical properties of elements in a group of the periodic table are described above. The elements described above belong to which group?

• Alkaline earth metals

• Noble gases

• Alkali metals

• Halogens

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The number of valence electrons in Group 2 elements is —

• 0

• 1

• 2

• 3

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The reactivity trends on the Periodic Table depends on valence electrons. What family on the Periodic Table is

identified as the most reactive nonmetals?

• 1

• 12

• 13

• 17

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