Rank from most to least active based on placement on periodic table : Magnesium, potassium, sodium.
1. NaOH
2. KOH
3. Mg(OH)2
Most active K.
Middle Na
Least active Mg
Look on the periodic table. The activity increases as you DOWN the table and decreases as you go across the table from left to right.
To determine the activity of elements based on their placement on the periodic table, you'll need to consider their positions within a specific group or period.
In this case, we're looking at three alkali metals: Magnesium (Mg), Potassium (K), and Sodium (Na). Alkali metals are known for their reactivity, and their activity generally increases as you move down a group from top to bottom.
1. Sodium (Na): Sodium is the least active among the three elements. It is located in Group 1, Period 3 of the periodic table. Sodium exhibits moderate reactivity and is typically less active than both potassium and magnesium.
2. Potassium (K): Potassium is more active than sodium. It is also in Group 1, but in Period 4. As you move down the group, the reactivity generally increases. Potassium reacts more vigorously with water and other substances compared to sodium.
3. Magnesium (Mg): Magnesium is the most active among the three elements. However, it is not an alkali metal like sodium and potassium. Magnesium is an alkaline earth metal. It is located in Group 2, Period 3 of the periodic table. While alkaline earth metals are generally less reactive than alkali metals, magnesium is still more active than both sodium and potassium in terms of its reactivity with other substances.
So, the ranking from most to least active based on their placement on the periodic table is: Magnesium, Potassium, Sodium.