In numericals,we use Z values-1 for sc,2 for bcc and 4 for fcc, but in this given question:

Potassium crystallises in a bcc lattice,hence the coordination number of potassium metal is 8. Why is it so?

Z stands for the number of atoms in a unit cell not for the coordination number.Hence in Bcc lattice the potassium crystal have coordination number 8 but the value of Z is 2

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