+Ca4 denotes a theoretical or observed cluster of four [Calcium](/wiki/Calcium) atoms. These unique [Atomic Clusters](/wiki/Atomic_Clusters) are studied for their distinct electronic properties, often differing significantly from bulk material.
+## See also
+- [Metal Clusters](/wiki/Metal_Clusters)
+- [Quantum Chemistry](/wiki/Quantum_Chemistry)
+- [Nanomaterials](/wiki/Nanomaterials)
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