Number of d electrons or unpaired electrons in a given transition metal ion

This type of question, asked 4 times: 3 May 2023 S1, 9 May 2023 S1, 20 Apr 2025 S1, 14 May 2026 S1. All 4 questions below, oldest first.

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Question 1
3 May 2023 S1
87 $What is the number of electrons present in 3d orbital of Ti in +2 state?$
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Question 2
9 May 2023 S1
60 $What is the number of electrons present in d-subshell if its atomic number is 27 and oxidation state is +2?$
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Question 3
20 Apr 2025 S1
87 $What is the number of unpaired electrons in Ti in +3 state?$
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Question 4
14 May 2026 S1
31 $(Z = 25)$
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Question 1