Explain the trend of chemical properties for elements in Period 3 and how their chlorides and oxides react with water.

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1. What is the relationship between the five elements mentioned?
The elements Sodium (Na), Magnesium (Mg), Silicon (Si), Phosphorus (P), and Chlorine (Cl) are all located in Period 3 of the periodic table. They exhibit a trend in properties across this period, transitioning from metallic (Na, Mg) to metalloid (Si) to non-metallic (P, Cl) characteristics.

2. Explain what happens when their chlorine and oxide are added to water.
3. Indicate whether the resultant solution will be base, acidic or neutral.

For questions 2 and 3, the phrase "their chlorine and oxide" is interpreted as referring to the chloride and oxide of each element (