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Filling of Electrons for Elements

Electronic co...

Question

Electronic configuration of elements X, Y and Z is given below:
X = 2, 7 Y = 2, 8, 5 Z = 2, 8, 8
Write the position of elements in the periodic table.

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Solution

X and Y are immediate neighbours in the same period. X is in group 17 and period 2, Fluorine.
Y is in group 18 and period 2, Neon.
Z is just below Y in group 18 and period 3, Argon.

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