Chemistryeasy · Past Paper
Which element has the atomic number 20?
APotassium
BScandium
CCalcium
DArgon
✓ Correct Answer: C — Calcium
Calcium follows Potassium in the periodic table with atomic number 20.
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✓ Correct Answer: C — Calcium
Calcium follows Potassium in the periodic table with atomic number 20.
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