Heavier elements into higher elements: ___________::Lighter elements into heavier elements : Nuclear fusion

Radioactivity element : uranium :: Lighter element :__________

Lighter gases diffuse______ heavier gases.

The element having the higher boiling point is

In period 2 element X is to the right of element Y . Then , find which of the element have : Low nuclear charge

Element with higher catenation capacity is

A nuclear reactor consists of five main elements . Four elements out of these five elements are given in the column-I and the commonly used material for these elements are given in column-II