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Which element has chemical properties that are most similar to potassium?*
In the ground state, all atoms of Group 15 elements have the same number of*
In which group on the Periodic Table would a nonmetallic element belong if atoms of this element tend to gain two electrons to complete their valence shell?*
Which properties are characteristic of Group 2 elements at STP?*
Which two elements have the most similar chemical properties?*
In the formula XSO4, the symbol X could represent the element*
Element X reacts with copper to form the compounds CuX and CuX2. In which group on the Periodic Table is element X found?*
In the formula for the compound XCl4, the X could represent*
Which elements have the most similar chemical properties?*
Which element has atoms that can form halide ions?*
Base your answers to questions 12 on the information below and on your knowledge of chemistry.
A thiol is very similar to an alcohol, but a thiol has a sulfur atom instead of an oxygen atom in the functional group. The equation below represents a reaction of methanethiol and iodine, producing dimethyl disulfide and hydrogen iodide.
Explain, in terms of electron configuration, why sulfur atoms and oxygen atoms form compounds with similar molecular structures.*
Base your answers to questions 13 on the information below and on your knowledge of chemistry.
In the late 1800s, Dmitri Mendeleev developed a periodic table of the elements known at that time. Based on the pattern in his periodic table, he was able to predict properties of some elements that had not yet been discovered. Information about two of these elements is shown in the table below.
Write a chemical formula for the compound formed between Ea and Cl.*
Base your answers to questions 14 on the information below and on your knowledge of chemistry.
Three elements, represented by D, E, and Q, are located in Period 3. Some properties of these elements are listed in the table below. A student’s experimental result indicates that the density of element Q is 2.10 g/cm3, at room temperature and standard pressure.
Identify the group on the Periodic Table to which element D belongs.*
Base your answers to questions 15 on the information below and on your knowledge of chemistry.
The diagram below represents three elements in Group 13 and three elements in Period 3 and their relative positions on the Periodic Table.
Some elements in the solid phase exist in different forms that vary in their physical properties. For example, at room temperature, red phosphorus has a density of 2.16 g/cm3 and white phosphorus has a density of 1.823 g/cm3.
Identify one element from the diagram that will combine with phosphorus in the same ratio of atoms as the ratio in aluminum phosphide.*