Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which of these elements is a metal?
- X
- W
-
Z
- Y
The correct answer is: C
Explanation
Element Z has electronic configuration of 2, 8, 8, 2. This implies it's in group 2 (Alkaline earth metals). Actually, the element is most likely to be Calcium with an atomic number of 20. The correct answer is option C
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