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Correct order of IE(1) are: (P) Li lt ...

Correct order of `IE_(1)` are:
(P) `Li lt B lt Be lt C` (Q) `O lt N lt F`
(R) `Be lt N lt Ne`

A

P,Q

B

Q only

C

P,R

D

P,Q,R

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct order of first ionization energies (IE₁) for the given elements, we will analyze the trends in ionization energy based on their electronic configurations and periodic trends. ### Step-by-Step Solution: 1. **Identify the Elements and Their Electronic Configurations**: - The elements in question are from the second period: - Lithium (Li): 1s² 2s¹ - Beryllium (Be): 1s² 2s² - Boron (B): 1s² 2s² 2p¹ - Carbon (C): 1s² 2s² 2p² - Nitrogen (N): 1s² 2s² 2p³ - Oxygen (O): 1s² 2s² 2p⁴ - Fluorine (F): 1s² 2s² 2p⁵ - Neon (Ne): 1s² 2s² 2p⁶ 2. **Understand the Trend of Ionization Energy**: - Ionization energy generally increases across a period from left to right due to increasing nuclear charge, which holds the electrons more tightly. - However, there are exceptions due to half-filled and fully filled subshells which provide extra stability. 3. **Analyze Each Given Order**: - **(P) `Li < B < Be < C`**: - Lithium has the lowest IE₁ because it has one electron in the outer shell and is easily ionized. - Boron has a higher IE₁ than lithium but lower than beryllium because it has a higher nuclear charge but is less stable than beryllium. - Beryllium has a higher IE₁ than boron because it has a fully filled 2s subshell, making it more stable and harder to ionize. - Carbon has a higher IE₁ than beryllium due to its increased nuclear charge and stability. - Therefore, this order is correct. - **(Q) `O < N < F`**: - Oxygen has a lower IE₁ than nitrogen because removing an electron from oxygen results in a half-filled p subshell (2p³), which is more stable. - Nitrogen has a higher IE₁ than oxygen but lower than fluorine, as fluorine has a very high nuclear charge and is very electronegative. - Thus, this order is also correct. - **(R) `Be < N < Ne`**: - Beryllium has a lower IE₁ than nitrogen because it is stable with a filled 2s subshell. - Nitrogen has a lower IE₁ than neon because neon has a completely filled outer shell, making it very stable. - Therefore, this order is also correct. 4. **Conclusion**: - All three orders (P, Q, R) are correct regarding the first ionization energies of the elements. ### Final Answer: The correct order of first ionization energies is **P, Q, R**.
To determine the correct order of first ionization energies (IE₁) for the given elements, we will analyze the trends in ionization energy based on their electronic configurations and periodic trends. ### Step-by-Step Solution: 1. **Identify the Elements and Their Electronic Configurations**: - The elements in question are from the second period: - Lithium (Li): 1s² 2s¹ - Beryllium (Be): 1s² 2s² ...
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Knowledge Check

  • With reference to 1^(st) IP which are correct. (a) Li lt C (b) O lt N (c ) Be lt N lt Ne

    A
    `a, b` only
    B
    `b,c` only
    C
    `a, c` only
    D
    `a,b & c`

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