Question

X, Y, Z are the elements with atomic number 7, 8, 9
arrange in decreasing order in their atomic radii​

Answer 1

Answer:

Three elements 'X', 'Y' and 'Z' having atomic numbers 7, 8 and 9 are nitrogen, oxygen and fluorine respectively. The atomic size decreases from left to right in a period in the modern periodic table. Hence, the decreasing order of their atomic radii is N > O > F.