X, Y and Z are three elements with atomic numbers (x-1), x and (x+1) respectively. If Y is a noble gas answer the following.
To which group X and Z belong?

X, Y and Z are three elements with atomic numbers (x-1), x and (x+1) respectively. If Y is a noble gas answer the following. Among X, Y and Z which would have positive value for electron gain enthalpy? Why?

X, Y and Z are three elements with atomic numbers (x-1), x and (x+1) respectively. If Y is a noble gas answer the following. Which of these elements would have the least ionisation energy? Justify.

X, Y and Z are respectively :

X, Y and Z are respectively :

Substances X,Y,Z and A are respectively

The angle between the planes x+y+z=1 and x-2y+3z=1 is

Element 'X' is having atomic number 28, it gives two electrons to element 'Y': In which block 'X' belongs?