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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).
Sodium (Na), Magnesium (Mg), Aluminium (Al)
Phosphorous (P), Sulphur (S), Chlorine (Cl), Argon (Ar)
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.