Metals form ___________

Explanation

**Step-by-Step Solution:**

1. **Understanding Metals**: Metals are elements that typically have certain properties such as good conductivity of heat and electricity, malleability, ductility, and a shiny appearance.

2. **Example of a Metal**: Let's take Sodium (Na) as an example of a metal. Sodium has an atomic number of 11.

3. **Electronic Configuration**: The electronic configuration of Sodium is 2, 8, 1. This means that Sodium has 2 electrons in its first shell (K shell), 8 electrons in its second shell (L shell), and 1 electron in its outermost shell (M shell).

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