Elements 11-20 by atomic number

The exercise was created 2021-03-18 by Enimya. Question count: 10.

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11 sodium
12 magnesium
13 aluminium
14 silicon
15 phosphorus
16 sulfur
17 chlorine
18 argon
19 potassium
20 calcium

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https://spellic.com/eng/exercise/elements-11-20-by-atomic-number.10352056.html