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Which of these four elements is the most reactive metal?

| 3 | 4 |
| --- | --- |
| Li | Be |
| 11 | 12 |
| Na | Mg |
| 19 | 20 |
| K | Ca |
| 37 | 38 |
| Rb | Sr |
| 55 | 56 |
| Cs | Ba |
| 87 | 88 |
| Fr | Ra |



Answer :

In this periodic table question, we need to determine the most reactive metal among the given elements.

The reactivity of metals can typically be mapped directly to their positions in the periodic table. Specifically, alkali metals, which occupy Group 1 of the periodic table, are known for their high reactivity. As you move down Group 1 from top to bottom, the reactivity of the metals increases.

Given the elements listed in Group 1:
- Lithium (Li) (Element 3)
- Sodium (Na) (Element 11)
- Potassium (K) (Element 19)
- Rubidium (Rb) (Element 37)
- Cesium (Cs) (Element 55)
- Francium (Fr) (Element 87)

Francium (Fr) is at the bottom of Group 1, making it the most reactive metal listed.

In the periodic table provided, locate the element Francium (Fr) which is at position 87. This is the most reactive metal among the provided choices.