Drag and drop the following elements into their various periods.
| PERIOD I |
PERIOD II |
PERIOD III |
PERIOD IV |
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Hydrogen 1
Helium 2
Lithium 2.1
Sodium 2.8.1
Potassium 2.8.8.1
Magnesium 2.8.2
Beryllium 2.2
Calcium 2.8.8.2
Chlorine 2.8.7
Boron 2.3
Aluminium 2.8.3
Sulphur 2.8.6
Carbon 2.4
Phosphorous 2.8.5
Silicon 2.8.4
Nitrogen 2.5
Oxygen 2.6
Flourine 2.7
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