is barium more reactive than caesium?

According to BBC, the group 1 elements become more reactive as you go down the group. At the top, Lithium is the least reactive and Francium at the bottom is the most reactive.

If you look in the periodic table of elements Caesium is in the group 1 of elements while Barium is in group 2. Therefore, Caesium is more reactive than Barium.

Cesium (Cs), also spelled caesium, chemical element of Group 1 (also called Group Ia) of the periodic table, the alkali metal group, and the first element to be discovered spectroscopically (1860), by German scientists Robert Bunsen and Gustav Kirchhoff, who named it for the unique blue lines of its spectrum (Latin caesius, “sky-blue”).

This silvery metal with a golden cast is the most reactive and one of the softest of all metals. It melts at 28.4 °C (83.1 °F), just above room temperature. It is about half as abundant as lead and 70 times as abundant as silver. Cesium occurs in minute quantities (7 parts per million) in Earth’s crust in the minerals pollucite, rhodizite, and lepidolite.

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