Answer:
Krypton is non metal.
Step-by-step explanation:
The difference between a metal and non metal is that metals are ready to give electrons to attain half filled or full filled electron stability.
Non metal are reluctant to give electrons.
Out of the given choices
a) Pt : platinum is a transition metal.
b) V : Vanadium is a transition metal.
c) Li: Lithium is an alkali metal
d) Kr : Krypton is a non metal. It is a noble gas with full filled stability.