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 Structure of the atom and the periodic table questions and answers

Figure 5 represents a grid that is part of the periodic table. Study it and answer the questions that follow.
figatom26520201558.JPG
(a) Write the electron arrangement of element C
(b) On the grid provided, show with a tick the position of element D whose atomic number is 18.
(c) Element E is more reactive than A. Explain.

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