Effective atomic number (EAN) of the central metal in a given complex

This type of question, asked 12 times: 2 May 2023 S2, 16 May 2023 S1, 10 May 2024 S1, 23 Apr 2025 S1, 25 Apr 2025 S2, 17 Apr 2026 S1, 17 Apr 2026 S2, 18 Apr 2026 S1, 18 Apr 2026 S2, 13 May 2026 S1, 14 May 2026 S1, 19 May 2026 S1. All 12 questions below, oldest first.

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Question 1
2 May 2023 S2
89 $[\text{Cu(NH}_3)_4]^{2+}$
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Question 2
16 May 2023 S1
54 $[\text{Zn(NH}_3)_4]^{2+}$
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Question 3
10 May 2024 S1
84 $_3$
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Question 4
23 Apr 2025 S1
66 $What is EAN of metal ion in hexacyanoferrate (II) ion?$
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Question 5
25 Apr 2025 S2
62 $\left\lbrack Zn\left( NH_{3} \right)_{4} \right\rbrack^{2 +}$
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Question 6
17 Apr 2026 S1
35 $[\mathrm{Co(NH_3)_6}]^{3+}$
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Question 7
17 Apr 2026 S2
34 $[\mathrm{Cu(NH_3)_4}]^{2+}$
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Question 8
18 Apr 2026 S1
34 $\mathrm{Fe(CO)_5}$
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Question 9
18 Apr 2026 S2
35 $[\mathrm{Fe(CN)_6}]^{3-}$
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Question 10
13 May 2026 S1
34 $[\mathrm{Pd(NH_3)_6}]^{4+}$
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Question 11
14 May 2026 S1
33 $\mathrm{K_3[Cr(C_2O_4)_3]}$
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Question 12
19 May 2026 S1
39 $\mathrm{[Cu(NH_3)_4]^{2+}}$
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Effective atomic number (EAN) of the central metal in a given complex

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Question 12