Complete the following statements:
c. Sodium and potassium are examples of elements called _____.

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Identify the periodic table group to which sodium (Na) and potassium (K) belong. Both are located in Group 1.

Understand that elements in Group 1 are known as alkali metals. This group includes lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Recall the properties of alkali metals: they are highly reactive, especially with water, and they form +1 ions in chemical reactions.

Note that alkali metals are characterized by having a single electron in their outermost shell, which makes them very reactive.

Conclude that sodium and potassium are examples of elements called alkali metals.

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Alkali Metals

Sodium and potassium belong to the group of elements known as alkali metals, which are found in Group 1 of the periodic table. These metals are characterized by their high reactivity, especially with water, and they typically form strong bases when reacting with acids. Alkali metals have one electron in their outermost shell, which they readily lose to form positive ions.

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01:08

Periodic Trend: Metallic Character

Periodic Table

The periodic table is a systematic arrangement of elements based on their atomic number, electron configuration, and recurring chemical properties. Elements are organized into rows (periods) and columns (groups), with alkali metals located in the first column. Understanding the periodic table is essential for predicting the behavior of elements and their compounds.

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02:40

Periodic Table: Classifications

Chemical Reactivity

Chemical reactivity refers to the tendency of a substance to undergo chemical changes, which can involve the formation of new substances. For alkali metals like sodium and potassium, reactivity increases down the group, meaning that cesium is more reactive than sodium. This property is crucial for understanding how these elements interact with other substances, particularly in biological and industrial processes.

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