Atomic number atomic mass and valency of first 20 elements
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Answer:
Element Atomic Number Valency
Argon 18 0
Potassium 19 +1
Calcium 20 +2
Scandium 21 +3
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Explanation:
Argon 18 0
Potassium 19 +1
Calcium 20 +2
Scandium 21 +3
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