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The most abundant gas in the air is...
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
The modern Periodic Table is arranged according to...
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
This element is an essential constituent of bones, teeth and shells
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
The Periodic Table contains...
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
This element can prevent you from suffering anaemia...
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
Oxygen, sulphur or selenium are...
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
The lightest element on Earth is...
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
This element is used to make toothpaste because it protects teeth from decay..
Hydrogen
7 periods
Chalcogens
Atomic number
Calcium
Nitrogen
Fluorine
Iron
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