Which one of the following is a transition metal?

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Q: 94 (NDA-I/2010)

Which one of the following is a transition metal?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,9,28,16,9,9,3

keywords: 

{'transition metal': [0, 0, 1, 0], 'magnesium': [1, 0, 2, 3], 'calcium': [2, 0, 0, 4], 'mg': [1, 0, 4, 6], 'mn': [0, 0, 1, 2]}

The correct answer is option 2: Manganese (Mn).

A transition metal is a type of element that belongs to the d-block of the periodic table. These elements have partially filled d-orbitals, which gives them unique properties and makes them useful in various applications.

Option 1: Aluminium (Al) is not a transition metal. It belongs to group 13 of the periodic table and has filled s and p orbitals.

Option 3: Magnesium (Mg) is not a transition metal. It belongs to group 2 of the periodic table and has filled s orbitals.

Option 4: Calcium (Ca) is also not a transition metal. It belongs to group 2 of the periodic table and has filled s orbitals.

Manganese (Mn) is a transition metal because it has partially filled d-orbitals. It is located in period 4 and group 7 of the periodic table. Transition metals often have variable oxidation states and show a wide range of colors due to their d-electrons. They are important in industries such as catalysis, electronics, and medicine.

In conclusion, Manganese (Mn) is the correct answer as it is a transition metal with partially filled d-orbitals.