Question

Three elements X, Y and Z have atomic numbers 7, 8 and 9 respectively.

1. Arrange them in the decreasing order of their atomic radii.
2. Which of the three is most electronegative? Why?
3. Write the formula of compound formed between
   1. X and Y
   2. X and Z

Answer 1

1. X > Y > Z
2. Z because electronegativity increase across the period.
3. 1. X₂Y₃
   2. XZ₃