During new home construction, when refrigerant lines are installed under a poured concrete slab, they're protected from physical damage?

Okay this will take 1 hour okay dont forget me.

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.