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There is one atom per unit cell for polonium atom .

In polonium the structure is simple cubic means there are 8 corner atoms.

What is a unit cell ?

Unit cell is defined as the smallest repeating unit in a crystal lattice which when repeated over and over again produces the complete crystal .

The unit cell represents the shape of the entire crystal .

The density of the unit cell is the same as that of its whole lattice .

A unit cell characterized by its definite shape  , its dimensions along the three edges as a, b and c . these edges may or may not be  perpendicular .

There are angle between the pair of edges called interfacial angles .

There are two types of unit cell : primitive unit cell and centered unit    cell .

The centered unit cell is of three types : body centered unit cell , face centered unit cell , and end centered unit cell .

Learn more about unit cell here :

brainly.com/question/10816130

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