# General Knowledge - Chemistry - Discussion

Discussion Forum : Chemistry - Section 1 (Q.No. 5)

5.

The number of d-electrons in Fe

^{2+}(Z = 26) is not equal to that ofDiscussion:

31 comments Page 1 of 4.
Osama Shata said:
2 years ago

Fe (Z=26) configuration is [Ar]18 4S2,3d6.

Fe2+ means it will lose two electrons from its outer shell which is 4S.

So the configuration is [Ar]18 4s0, 3d6 . here the Fe2+ is stable because orbitals are fully filled or fully empty. d-electrons Numbers are 6.

Ne10 configuration is 1S2,2S2,2p6. p-electrons Numbers are 6

Mg12 configuration is 4s2,2s2,2p6,3s2 so s-electrons Numbers are 6

Cl17 configuration is 4s2,2s2,2p6,3s2,4p5. After applying half filled orbitals rule, the configuration will be 4s2,2s2,2p6,3s1,3p6 so p-electrons Numbers are 12

So, D is the correct answer.

Fe2+ means it will lose two electrons from its outer shell which is 4S.

So the configuration is [Ar]18 4s0, 3d6 . here the Fe2+ is stable because orbitals are fully filled or fully empty. d-electrons Numbers are 6.

Ne10 configuration is 1S2,2S2,2p6. p-electrons Numbers are 6

Mg12 configuration is 4s2,2s2,2p6,3s2 so s-electrons Numbers are 6

Cl17 configuration is 4s2,2s2,2p6,3s2,4p5. After applying half filled orbitals rule, the configuration will be 4s2,2s2,2p6,3s1,3p6 so p-electrons Numbers are 12

So, D is the correct answer.

(3)

Desale Moges said:
3 years ago

The electron configuration of Fe+2 will be [Ar]4S13d5.

(2)

M. Ganga rajasree said:
6 years ago

Thanks all for explaining the answer.

(1)

M Mishra said:
6 years ago

But I think the question is incorrect, as it asked.

It should be, The number of d-electrons in Fe2+ (Z = 26) is equal to that of.

It should be, The number of d-electrons in Fe2+ (Z = 26) is equal to that of.

(1)

Shikamaru Nara said:
1 decade ago

The 4s orbital is at a higher energy level than the 3d orbitals and so because it is Fe(2+) the two electrons both leave the 4s orbital, leaving the 3d orbital with 6 electrons. And so:

No.of p electrons in Ne is 6(2p6).

No.of s electrons in Mg is 6(1s2,2s2,3s2).

No.of d electrons in Fe is 6 (d6).

No.of p electrons in Ci is 11(2p6,3p5).

No.of p electrons in Ne is 6(2p6).

No.of s electrons in Mg is 6(1s2,2s2,3s2).

No.of d electrons in Fe is 6 (d6).

No.of p electrons in Ci is 11(2p6,3p5).

(1)

Ramanuj said:
8 years ago

To start up, the electron configuration of Fe atom is 1s2 2s2 2p6 3s2 3p6 4s2 3d6.

Since the problem is Fe2+ ion, than two electrons are removed from the atom so the correct configuration is 1s2 2s2 2p6 3s2 3p6 3d6.

Likewise, re-check your second configuration. I'm assuming you intended to write it as 1s2 2s2 2p6 3s2 3p6 4s2 3d4. This is incorrect because by then, the element would not be Fe2+ ion. Instead, this would be the electronic configuration of "chromium atom".

Basically, 2 electrons in the 4s orbital are removed because it is much farther away from the nucleus than 3d orbital. Since the electrons in 4s are farther and have weaker pull from the nucleus, there's more tendency for them to be dislodged from the atom.

Since the problem is Fe2+ ion, than two electrons are removed from the atom so the correct configuration is 1s2 2s2 2p6 3s2 3p6 3d6.

Likewise, re-check your second configuration. I'm assuming you intended to write it as 1s2 2s2 2p6 3s2 3p6 4s2 3d4. This is incorrect because by then, the element would not be Fe2+ ion. Instead, this would be the electronic configuration of "chromium atom".

Basically, 2 electrons in the 4s orbital are removed because it is much farther away from the nucleus than 3d orbital. Since the electrons in 4s are farther and have weaker pull from the nucleus, there's more tendency for them to be dislodged from the atom.

(1)

Sudha said:
9 years ago

P electrons of Ne-2p6, s electron of Mg-3s2, d electron of Fe-3d6 but p electron of Cl is 3p5. So answer may be option D.

(1)

Sundu said:
9 years ago

What is the molar mass of hydrogen H2?

Clevein said:
8 months ago

The electron configurations are as follows:

1. **Fe²⁺ (Z = 26):** [Ar] 3d⁶.

=> The number of d-electrons is 6.

2. **Ne (Z = 10):** 1s² 2s² 2p⁶

=> There are no p-electrons in Ne.

3. **Mg (Z = 12):** 1s² 2s² 2p⁶ 3s²

=> The number of s-electrons is 2.

4. **Fe (Z = 26):** [Ar] 4s² 3d⁶

=> The number of d-electrons is 6.

5. **Cl (Z = 17):** 1s² 2s² 2p⁶ 3s² 3p⁵

=> The number of p-electrons is 5.

In summary:

- The number of d-electrons in Fe²⁺ (Z = 26) is **6**.

- The number of p-electrons in Ne (Z = 10) is **0**.

- The number of s-electrons in Mg (Z = 12) is **2**.

- The number of d-electrons in Fe (Z = 26) is **6**.

- The number of p-electrons in Cl (Z = 17) is **5**.

Therefore, the statement is correct.

The number of d-electrons in Fe²⁺ is not equal to the specified electron counts in Ne, Mg, Fe, and Cl.

1. **Fe²⁺ (Z = 26):** [Ar] 3d⁶.

=> The number of d-electrons is 6.

2. **Ne (Z = 10):** 1s² 2s² 2p⁶

=> There are no p-electrons in Ne.

3. **Mg (Z = 12):** 1s² 2s² 2p⁶ 3s²

=> The number of s-electrons is 2.

4. **Fe (Z = 26):** [Ar] 4s² 3d⁶

=> The number of d-electrons is 6.

5. **Cl (Z = 17):** 1s² 2s² 2p⁶ 3s² 3p⁵

=> The number of p-electrons is 5.

In summary:

- The number of d-electrons in Fe²⁺ (Z = 26) is **6**.

- The number of p-electrons in Ne (Z = 10) is **0**.

- The number of s-electrons in Mg (Z = 12) is **2**.

- The number of d-electrons in Fe (Z = 26) is **6**.

- The number of p-electrons in Cl (Z = 17) is **5**.

Therefore, the statement is correct.

The number of d-electrons in Fe²⁺ is not equal to the specified electron counts in Ne, Mg, Fe, and Cl.

Maria khan said:
5 years ago

Please give the correct answer description.

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