D: 2 and 4
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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
Three different beakers are set up as shown. In beaker 1 metal W is displaced from solution. In beaker 2 metal X is d…
Which graph shows the number of electrons in the outer shell of an atom, plotted against the proton (atomic) number f…
Which pair of elements, when combined together, do not form a covalent compound?
The diagram shows the structure of a covalent compound containing the element hydrogen, H, and the unknown elements X…