D: transition metals
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Which graph shows the number of electrons in the outer shell of an atom, plotted against the proton (atomic) number f…
The diagram shows part of the Periodic Table. Which pair of letters represents elements that are in the same period?
Which row shows the correct number of protons and electrons in the ion of an element in Group II of the Periodic Table?
Equations for reactions of iron and iron compounds are shown. Fe + 2HCl → FeCl2 + H2 2FeCl2 + Cl2 → 2FeCl3 FeSO4 + Mg…
Which is a use of sulfuric acid?
The table shows the solubility of some compounds of metal Q in cold water. salt | solubility in cold water ---|--- c…