Give the symbol of the element that has the (4.7)a. largest atomic size in Group 1A (1)

Verified step by step guidance

1. Identify the elements in Group 1A (1), also known as the alkali metals. These include: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).
2. Understand that atomic size increases as you move down a group in the periodic table. This is because each successive element has an additional electron shell, making the atom larger.
3. Compare the atomic sizes of the elements in Group 1A. The element with the largest atomic size will be the one furthest down the group.
4. Recognize that Francium (Fr) is the element at the bottom of Group 1A, indicating it has the largest atomic size among the alkali metals.
5. Conclude that the symbol for the element with the largest atomic size in Group 1A is Fr.

Key Concepts

Atomic Size

Atomic size refers to the distance from the nucleus of an atom to the outermost shell of electrons. It generally increases down a group in the periodic table due to the addition of electron shells, which outweighs the increase in nuclear charge. This concept is crucial for understanding trends in atomic properties.

Group 1A Elements

Group 1A, also known as the alkali metals, includes elements like lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These elements are characterized by having one electron in their outermost shell, which influences their reactivity and atomic size. Understanding their position in the periodic table helps in predicting their properties.

Periodic Trends

Periodic trends are patterns observed in the periodic table that describe how certain properties of elements change across periods and down groups. For instance, atomic size increases down a group and decreases across a period. Recognizing these trends is essential for predicting the behavior of elements, including which has the largest atomic size in a given group.