Answer:
Calicum
Explanation:
This is true because calcium loses more electrons and is a group 2 metal
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2.16x10^-03
molarity=mass÷volume
0.540÷250
Mn Manganese
In weight/volume (w/v) terms,
1 ppm = 1g m-3 = 1 mg L-1 = 1 μg mL-1
200 mL = 0.2 L
15 / 0.2 mg L-1 =75 ppm