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The number of d-electrons in Fe 2 + ( Z = 26 ) ^{2+} (Z = 26) 2 + ( Z = 26 ) is not equal to the number of electrons in which one of the following?
medium
The d and f Block Elements
2015
chemistry
p-electrons in Cl (Z = 17)
d-electrons in Fe (Z = 26)
p-electrons in Ne (Z = 10)
s-electrons in Mg (Z = 12)
Explanation To solve this problem, we need to determine the number of d-electrons in Fe 2 + ^{2+} 2 + and compare it with the number of electrons in other given options.
\newline 1. Calculate the number of d-electrons in Fe 2 + : ^{2+}:
\newline 2 + :
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ā¢ The atomic number of iron (Fe) is 26, so the electronic configuration of neutral Fe is:
Ar
] ā 3 d 6 ā 4 s 2 ] \, 3d^6 \, 4s^2
\newline ] 3 d 6 4 s 2 ā¢ In
Fe
two electrons are removed. Electrons are removed first from the 4s orbital, then from the 3d orbital.
ā¢ Therefore, the electronic configuration of
Fe
is:
Ar
] ā 3 d 6 ] \, 3d^6
\newline ] 3 d 6 ā¢ Thus, the number of d-electrons in
Fe
is 6.
2. Calculate the number of electrons in each option:
ā¢ Option 1: p-electrons in Cl (Z = 17)
- The electronic configuration of Cl is:
Ne
] ā 3 s 2 ā 3 p 5 ] \, 3s^2 \, 3p^5
\newline ] 3 s 2 3 p 5 - The number of p-electrons is 5.
ā¢ Option 2: d-electrons in Fe (Z = 26)
- The electronic configuration of neutral Fe is:
Ar
] ā 3 d 6 ā 4 s 2 ] \, 3d^6 \, 4s^2
\newline ] 3 d 6 4 s 2 - The number of d-electrons is 6.
ā¢ Option 3: p-electrons in Ne (Z = 10)
- The electronic configuration of Ne is:
1 s 2 ā 2 s 2 ā 2 p 6
\newline 1s^2 \, 2s^2 \, 2p^6
\newline 1 s 2 2 s 2 2 p 6 - The number of p-electrons is 6.
ā¢ Option 4: s-electrons in Mg (Z = 12)
- The electronic configuration of Mg is:
Ne
] ā 3 s 2 ] \, 3s^2
\newline ] 3 s 2 - The number of s-electrons is 4 (2 from 1s, 2 from 2s, and 2 from 3s).
3. Compare the number of electrons:
ā¢ The number of d-electrons in
Fe
is 6.
ā¢ The number of p-electrons in Cl is 5, which is not equal to 6.
Therefore, the number of d-electrons in
Fe
is not equal to the number of p-electrons in Cl.
This corresponds to Option 1.