D: S²⁻
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An atom, X, contains 16 protons. Which statement about X is correct?
An atom of which element gains three electrons when it forms an ion?
Part of the Periodic Table is shown. The letters are not the symbols of the elements. Which statement about the eleme…
The boiling points of gaseous elements increase as the size of their atoms increases. Which of these noble gases has …
The sentence describes two metals and their oxides. Metal X could be copper because its oxide is ......1.... and meta…
Which gas could be used to convert copper(II) oxide to copper?