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:
IS LOL JSIM M 12355890B 44178 23456 234567 34567HJ34567E567 67890
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here is your answer
Step-by-step explanation:
It is a metal. Calcium (Ca), valency of Ca is 2
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