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The elements A, B, C, D and E have atomi...

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group ?

A

A and B

B

B and D

C

A and C

D

D and E

Text Solution

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The correct Answer is:
To determine which pair of elements belongs to the same group based on their atomic numbers, we will follow these steps: ### Step 1: Identify the elements and their atomic numbers - Element A: Atomic number 9 - Element B: Atomic number 11 - Element C: Atomic number 17 - Element D: Atomic number 12 - Element E: Atomic number 13 ### Step 2: Write the electronic configurations for each element - **Element A (Atomic number 9)**: - Electronic configuration: 2, 7 - **Element B (Atomic number 11)**: - Electronic configuration: 2, 8, 1 - **Element C (Atomic number 17)**: - Electronic configuration: 2, 8, 7 - **Element D (Atomic number 12)**: - Electronic configuration: 2, 8, 2 - **Element E (Atomic number 13)**: - Electronic configuration: 2, 8, 3 ### Step 3: Determine the number of valence electrons for each element - **Element A**: 7 valence electrons - **Element B**: 1 valence electron - **Element C**: 7 valence electrons - **Element D**: 2 valence electrons - **Element E**: 3 valence electrons ### Step 4: Identify pairs of elements with the same number of valence electrons - Elements A and C both have 7 valence electrons. ### Step 5: Determine the group of the elements - Elements with the same number of valence electrons belong to the same group in the periodic table. - Element A (Fluorine) and Element C (Chlorine) both belong to Group 17 (the Halogens). ### Conclusion The pair of elements that belong to the same group is **A (Atomic number 9) and C (Atomic number 17)**. ### Final Answer **A and C belong to the same group (Group 17).** ---
To determine which pair of elements belongs to the same group based on their atomic numbers, we will follow these steps: ### Step 1: Identify the elements and their atomic numbers - Element A: Atomic number 9 - Element B: Atomic number 11 - Element C: Atomic number 17 - Element D: Atomic number 12 - Element E: Atomic number 13 ...
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