Complexes in which the metal atom or ion is linked to only one type of ligands are called …… whereas those in which metal atom is linked to more than one type of ligands are called …… .

Explanation

To answer the question regarding coordination compounds, we need to define two types of complexes based on the ligands they contain.

### Step-by-Step Solution:

1. **Understanding Coordination Compounds**: Coordination compounds consist of a central metal atom or ion bonded to surrounding ligands. Ligands are ions or molecules that donate a pair of electrons to the metal.

**Hint**: Remember that ligands can be classified based on their number and type.

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