Sodium is an example of an alkali metal. The alkali metals are found in the leftmost column of the periodic table, known as Group 1. Use the interactive periodic table to explore the properties of the following alkali metals: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). The animations demonstrate a chemical property common to alkali metals: they react with water. How does the reactivity vary among this group of elements? Why might patterns like this be useful to scientists?

The reactivity greatens the farther you go down on the periodic table. Lithium will have the weakest reaction, and cesium will have the greatest reaction. Patterns like this are useful to scientists because it shows which elements are the most reactive and which aren't. The farther down and to the left you go within the periodic table, the more reactive the elements become. The farther up and to the right you go, the less reactive they become.

Explanation:

pstnonsonjoku pstnonsonjoku · Answer 2 · 2021-09-10T19:48:40+02:00

The reactivity of alkali metals increases down the group. Periodic trends help scientists to predict the reactivity of newly discovered elements.

In group 1, reactivity of elements increases down the group because as you go down the group more shells are added thereby making it easier to remove the outermost electron.

This explains the increase in chemical reactivity from Lithium to cesium.

These periodic trends are very important in predicting the chemical reactivity of newly discovered elements that are added to a group.

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