________________☆_______________ An elements X who atomic number is 20 mass number is equal to 40 find me and valency metal or nonmetal? _________________☆_______________
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________________☆_______________ An elements X who atomic number is 20 mass number is equal to 40 find me and valency metal or nonmetal? _________________☆_______________
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Answer:
Element X is calcium
Explanation:
It is a metal with valency 2