Chemistry question bank

Based on the information provided, what group of elements did William Ramsey discover?

• Group 1

• Group 15

• Group 17

• Group 18

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

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.

• Non-metal, Mass: 72

• Metalloid, Mass: 78

• Reactive metal, Mass: 71

• Metalloid, Mass: 74

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J. Priestly discovered that many carbon-containing materials burn in the presence of oxygen gas. However, the rest of the elements in the carbon family do not react the same way. What explains this phenomenon?

• Reactivity decreases going down a family.

• Electron affinity increases going up a family.

• The other elements in the family have a greater density.

• Oxygen is a diatomic element that reacts with other reactive nonmetals.

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A piece of gold foil was hit with alpha particles that mostly went right through the foil. This showed that the gold atoms are mostly empty space. What is the physical property of gold that led Rutherford to select it for his experiment?

• Gold is ductile.

• Gold is unreactive.

• Gold can be flattened.

• Gold has a positive charge.

Using the Periodic Table, predict which elements will have similar chemical properties or reactivity.

• Cadmium, calcium, and carbon

• Magnesium, strontium, and barium

• Rubidium, yttrium, and zirconium

• Nitrogen, sulfur, and bromine

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From which of the following atoms would it be the most difficult to remove an electron?

• Sodium

• Aluminum

• Sulfur

• Chlorine

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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.

The reactivity trends on the Periodic Table depend on valence electrons. What family on the Periodic Table is identified as the most reactive nonmetals?

• 1

• 12

• 13

• 17

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