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What is the cause for placing calcium in 2 or IIA group of the Modern periodic table? ​

What is the cause for placing calcium in 2 or IIA group of the Modern periodic table? ​
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What is the cause for placing calcium in 2 or IIA group of the Modern periodic table? ​

User PovilasID
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Answer:

Since it has 2 valence electrons

Step-by-step explanation:

User Jonas Lundgren
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