Therr elements A, B and C have atomic numbers as x,x + 1 and x + 2. The atomic size of C is greater than that of B but positions of B is less than that of A. Predict the positions of A, B amd C in the periodic table and justify the trend in atomic size.

Therr elements A, B and C have atomic numbers as x,x + 1 and x + 2. Th

1.	Therr elements A, B and C have atomic numbers as x,x + 1 and x + 2. The atomic size of C is greater than that of B but positions of B is less than that of A. Predict the positions of A, B amd C in the periodic table and justify the trend in atomic size.
Answer» As the atomic numbers of A,B and C differ by 1 unit each they must be belonging to adjacent group. Along a period the atomic size decreases till the VII A group and then increases till the zero group. As the atomic size of C is greater than B though it differs by one unit in its atomic number it must be a zero group element. Though the atomic number of B is greater than A, it has smaller size than Band this shows that B is a halogen, that is VII A group and A chalcogen, that is, VI A group.

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Therr elements A, B and C have atomic numbers as x,x + 1 and x + 2. The atomic size of C is greater than that of B but positions of B is less than that of A. Predict the positions of A, B amd C in the periodic table and justify the trend in atomic size.

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