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Assertion: Mn atom loses ns electrons fi...

Assertion: Mn atom loses ns electrons first during ionisation as compared to `(n-1)` d electrons
Reason: The effective nuclear charge experienced by `(n-1)`d electrons is greater than that by ns electrons.

A

Statement-1 is true , Statement-2 is true and Statement-2 is correct explanation for Statement-1

B

Statement-1 is true, Statement-2 is True and Statement-2 is Not correct explanation for statement-1

C

Statement-1 is true, Statement-2 is False

D

Statement-1 is False, Statement-2 is True

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the assertion and reason about the ionization of manganese (Mn), we can break it down into the following steps: ### Step 1: Identify the Electronic Configuration of Manganese Manganese (Mn) has an atomic number of 25. Therefore, its electronic configuration is: \[ \text{Mn: } [\text{Ar}] 3d^5 4s^2 \] ### Step 2: Understand the Orbital Energies In the case of transition metals, the 4s orbital (ns) is filled before the 3d orbital (n-1d). However, during ionization, the order in which electrons are removed can differ from the order in which they were added. ### Step 3: Compare the Effective Nuclear Charge The effective nuclear charge (Z_eff) is the net positive charge experienced by an electron in a multi-electron atom. The 3d electrons (n-1d) are closer to the nucleus compared to the 4s electrons (ns). This means that the 3d electrons experience a greater effective nuclear charge. ### Step 4: Determine Which Electrons are Lost First Due to the greater effective nuclear charge experienced by the 3d electrons, they are held more tightly by the nucleus compared to the 4s electrons. Therefore, during ionization, manganese loses its 4s electrons first before losing any 3d electrons. ### Step 5: Conclusion Based on the above reasoning: - **Assertion**: Mn atom loses ns electrons (4s) first during ionization as compared to (n-1)d electrons (3d) - **True** - **Reason**: The effective nuclear charge experienced by (n-1)d electrons is greater than that by ns electrons - **True** Since both the assertion and reason are true, and the reason explains the assertion, we conclude that both statements are correct, and the reason is a valid explanation for the assertion. ### Final Answer Both the assertion and reason are true, and the reason explains the assertion. ---
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