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Atoms of eight elements A, B, C, D, E, F...

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but are different in their outermost shells. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of element D is almost neutral.
To which group or period of the periodic table do the elements A and B belong?

A

1 and 2

B

13 and 14

C

15 and 16

D

17 and 18

Text Solution

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The correct Answer is:
To determine the group and period of elements A and B in the periodic table, we can follow these steps: ### Step 1: Identify the nature of elements A and G - It is stated that elements A and G combine to form an ionic compound. This suggests that one of the elements is a metal (A) and the other is a non-metal (G). Since the compound can be extracted from seawater, we can deduce that A is likely sodium (Na), which is a metal, and G is likely chlorine (Cl), a non-metal. **Hint:** Ionic compounds typically form between metals and non-metals. ### Step 2: Determine the nature of oxides - The problem states that the oxides of elements A and B are basic in nature. Basic oxides are typically formed by metals. Therefore, both A and B must be metals. **Hint:** Basic oxides are characteristic of metals. ### Step 3: Identify the nature of elements E and F - The oxides of elements E and F are acidic, indicating that these elements are non-metals. **Hint:** Non-metals tend to form acidic oxides. ### Step 4: Analyze the oxide of element D - The oxide of element D is described as almost neutral. This suggests that D could be a metalloid or an element that forms amphoteric oxides. **Hint:** Amphoteric oxides can react with both acids and bases. ### Step 5: Determine the groups of A and B - Since A is likely sodium (Na), which belongs to Group 1 of the periodic table, we need to identify B. Given that B's oxide is also basic, it could be magnesium (Mg), which belongs to Group 2. **Hint:** Group 1 elements are alkali metals, while Group 2 elements are alkaline earth metals. ### Step 6: Conclude the groups and periods - Both A (sodium) and B (magnesium) belong to the first and second groups of the periodic table, respectively. Sodium is in Period 3 and Magnesium is also in Period 3. **Hint:** Elements in the same period have the same number of electronic shells. ### Final Answer - Elements A and B belong to Group 1 and Group 2 of the periodic table, respectively, and both are in Period 3.
To determine the group and period of elements A and B in the periodic table, we can follow these steps: ### Step 1: Identify the nature of elements A and G - It is stated that elements A and G combine to form an ionic compound. This suggests that one of the elements is a metal (A) and the other is a non-metal (G). Since the compound can be extracted from seawater, we can deduce that A is likely sodium (Na), which is a metal, and G is likely chlorine (Cl), a non-metal. **Hint:** Ionic compounds typically form between metals and non-metals. ### Step 2: Determine the nature of oxides ...
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