Select the pair of elements you would expect to have similar chemical properties.

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Question restatement: Identify the pair of elements that are expected to have similar chemical properties.
Option 1: Al and Cl — Aluminum (Al) is a metal in group 13, while chlorine (Cl) is a halogen in group 17. They belong to different groups and have quite different chemical behaviors (Al tends to form covalent/ionic bonds with oxygen and other elements; Cl is highly reactive as a halogen). This pair does not share similar chemistry.
Option 2: N and Ni — Nitrogen (N) is a nonmetal in group 15, and nickel (Ni) is a transition metal. Their bonding tendencies, reactivity, and typical compounds are markedly different, so they do not exhibit similar chemical properties.
Option 3: Rb and Ra — Rubidium (Rb) is an alkali metal (group 1) while radium (Ra) is an alkaline earth metal (group 2). Although both are highly reactive metals, their chemistry diverges due to differences in valence electrons and typical oxidation states, making their properties not as closely aligned as within the same group.
Option 4: Li and Cs — Lithium (Li) and cesium (Cs) are both alkali metals in the same group (group 1) of the periodic table. They share similar physical properties (soft, highly reactive metals) and chemical behavior (forming +1 ions, similar trends in reactivity down the group), which explains why they are expected to have similar chemical properties.
Option 5: As and Se — Arsenic (As) is a metalloid in group 15, while selenium (Se) is a nonmetal in group 16. While they are neighbors in the periodic table and share some chalcogen/metalloid characteristics, their chemical properties differ in reactivity and typical compounds, so this pair is not as similar as Li and Cs.
In summary, the pair that best fits the criterion of similar chemical properties is Li and Cs, since they are in the same group and exhibit parallel chemical behavior across alkali metals. The remaining options involve elements from different groups or with distinct bonding tendencies, leading to notable differences in their chemistry.

Select the pair of elements you would expect to have similar chemical properties.

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