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 Structure of the atom and the periodic table questions and answers

The table below shows the number of valence electrons of the element P, Q and R.
figatom26520201430.JPG
(a) Explain why P and R would not be expected to form a compound.
(b) Write an equation to show the effect of heat on the carbonate of R.
(c) Write the formula of the most stable ion of Q.

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