The dot and cross diagram shows that a water molecule is made up of one oxygen atom joined to two hydrogen atoms, so the formula of water is H 2 O. A nitrogen molecule is made up of two nitrogen ...
Its formula is written ... The atmosphere is made up of around 78% nitrogen (Nâ‚‚) and 21% oxygen (Oâ‚‚). Both of these are present as molecules of two atoms bonded together.
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