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### Theory:

Activity 5.9

1. Examine third-period elements and classify them as metals and non-metals.

The third-period elements are sodium (Na), magnesium (Mg), aluminium (Al), silicon (Si), phosphorus (P), sulphur (S), chlorine (Cl), and argon (Ar).

 Metals Sodium (Na), Magnesium (Mg), Aluminium (Al) Non-metals Phosphorous (P), Sulphur (S), Chlorine (Cl), Argon (Ar) Metalloid Silicon (Si)

Note: Argon (Ar) is an inert gas that is classified as non-metal.

2. Metals are found on which side of the periodic table?

Metals are found on the periodic table's left side.

3. Non-metals are found on which side of the periodic table?

Non-metals are found on the periodic table's right side.

As we can notice, metals like Na and Mg are on the left side of the periodic table, while non-metals like Sulphur and Chlorine are on the right. We have Silicon in the middle, classified as a semi-metal or metalloid because it has properties similar to both metals and non-metals.

Metals and non-metals are separated in the modern periodic table by a zig-zag line. The borderline elements with intermediate properties, such as boron, silicon, germanium, arsenic, antimony, tellurium, and polonium, are metalloids or semi-metals.

As you can see in Chapter $$3$$ (Metals and Non-metals), metals are electropositive in nature because they prefer to lose electrons while forming bonds.