Question

1. which of the following elements is a transition metal?

a) magnesium

b) oxygen

c) cobalt

d) calcium

Explanation:

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<reasoning>

Identify the periodic table classification of each option

• Magnesium: Group 2 (Alkaline Earth Metal)
• Oxygen: Group 16 (Nonmetal)
• Cobalt: Groups 3–12 (Transition Metal, d-block)
• Calcium: Group 2 (Alkaline Earth Metal)

Select the element that is a transition metal

• Cobalt is a transition metal located in Group 9, Period 4.

</reasoning>

<answer>
<mcq-option>A) magnesium</mcq-option>
<mcq-option>B) oxygen</mcq-option>
<mcq-correct>C) cobalt</mcq-correct>
<mcq-option>D) calcium</mcq-option>
</answer>

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"question_type": "Multiple Choice",
"knowledge_point": [
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Answer:

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<reasoning>

Identify the periodic table classification of each option

• Magnesium: Group 2 (Alkaline Earth Metal)
• Oxygen: Group 16 (Nonmetal)
• Cobalt: Groups 3–12 (Transition Metal, d-block)
• Calcium: Group 2 (Alkaline Earth Metal)

Select the element that is a transition metal

• Cobalt is a transition metal located in Group 9, Period 4.

</reasoning>

<answer>
<mcq-option>A) magnesium</mcq-option>
<mcq-option>B) oxygen</mcq-option>
<mcq-correct>C) cobalt</mcq-correct>
<mcq-option>D) calcium</mcq-option>
</answer>

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"question_type": "Multiple Choice",
"knowledge_point": [
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