The Periodic Table contains...
The elements situated in the first group are called...
The lightest element on Earth is...
The modern Periodic Table is arranged according to...
The Periodic System contains...
The most abundant gas in the air is...
Oxygen, sulphur or selenium are...
This element is an essential constituent of bones, teeth and shells
This element is used to make toothpaste because it protects teeth from decay..
This element can prevent you from suffering anaemia...
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