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The table below shows the atomic numbers of four elements W,X,Y and Z

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asked Aug 5, 2021 in Chemistry Form 2 by anonymous

The table below shows the atomic numbers of four elements W,X,Y and Z

Element	W	X	Y	Z
Atomic number	20	17	19	9

Which two elements belong to the same group?

structure of the atom and the periodic table

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answered Aug 5, 2021 by anonymous

X and Z

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