A, B, C are three elements with atomic numbers, `Z-1, Z " and " Z + 1` respectively. B is an inert gas. Answer the follwing questions.
Predict the group of A and C.

A, B, C are three elements with atomic numbers, Z-1, Z " and " Z + 1 respectively. B is an inert gas. Answer the follwing questions. Which of the three has least value of ionization energy?

The atomic numbers of elements A,B,C and D are Z - 1, Z, Z + 1 and Z + 2 respectively. If B is a noble gas, choose the correct statement among the following statements : I. A has higher electron affinity. II. C exists in +2 oxidation state. III. D is an alkaline earth metal.

Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respectively. (a) State their positions (Group number and period number both) in the Modern Periodic Table. (b) Arrange these elements in the decreasing order of their atomic radii. (c) Write the formula of the compound formed when 'X' combines with 'Z'.

There are three elements A, B and C. their atomic number are Z_(1), Z_(2) and Z_(3) respectively. If Z_(1)-Z_(2)=2 and (Z_(1)+Z_(2))/(2)=Z_(3)-2 and the electronic configuration of element A is [Ar]3d^(6)4s^(2) , then correct order of magnetic momentum is/are: