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{:("Column A"," Column B"),("a. Highest ...

`{:("Column A"," Column B"),("a. Highest element"," i. Cesium"),("b. Highest metal"," ii. Osmium"),("c. Heaviest metal"," iii. Lithium"),("d. Most reactive metal"," iv. Hydrogen"):}`

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To solve the matching question between Column A and Column B, we will analyze each item in Column A and find the corresponding item in Column B. ### Step-by-Step Solution: 1. **Identify the Highest Element:** - The highest element in the periodic table is Hydrogen (H), which is located at the top of the periodic table in the first period. - **Match:** a. Highest element → iv. Hydrogen 2. **Identify the Highest Metal:** - The highest metal in terms of atomic number in the periodic table is Lithium (Li), which is the first metal in the periodic table, located in the second period. - **Match:** b. Highest metal → iii. Lithium 3. **Identify the Heaviest Metal:** - The heaviest metal based on atomic mass is Osmium (Os), which has an atomic number of 76. - **Match:** c. Heaviest metal → ii. Osmium 4. **Identify the Most Reactive Metal:** - The most reactive metal is Cesium (Cs), which is located in Group 1 (alkali metals) and is known for its high reactivity. - **Match:** d. Most reactive metal → i. Cesium ### Final Matches: - a → iv (Hydrogen) - b → iii (Lithium) - c → ii (Osmium) - d → i (Cesium) ### Summary of Matches: - a. Highest element → iv. Hydrogen - b. Highest metal → iii. Lithium - c. Heaviest metal → ii. Osmium - d. Most reactive metal → i. Cesium ---
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Knowledge Check

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    A
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    B
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    C
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    D
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    A
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    C
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    D
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    A
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    B
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    C
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    D
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