Write a feature which will distinguish a metallic solid from an ionic solid.

Explanation

To distinguish between a metallic solid and an ionic solid, we can focus on their electrical conductivity and physical properties. Here’s a step-by-step solution:

### Step 1: Define Metallic Solids
Metallic solids are characterized by a lattice of metal cations surrounded by a sea of delocalized electrons. This structure allows them to conduct electricity and heat efficiently.

### Step 2: Define Ionic Solids
Ionic solids consist of a lattice of positively and negatively charged ions. The strong electrostatic forces between these ions hold them in place, which affects their conductivity and physical properties.

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