A: chromatography
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The diagram shows the structure of a covalent compound containing the element hydrogen, H, and the unknown elements X…
A metal consists of a lattice of positive ions in a 'sea of electrons'. What changes, if any, take place to the elect…
Which molecule has the largest number of electrons involved in covalent bonds?
An atom of which element gains three electrons when it forms an ion?
A metal X forms oxides with the formulae XO and X2O3. Where is X in the Periodic Table?
Which pair of metals are not oxidised when added to water? 1. calcium 2. copper 3. potassium 4. silver