The element with the largest atomic radius in the periodic table is Francium (Fr). Francium is an alkali metal and is located at the bottom of Group 1 of the periodic table. Its atomic number is 87.
Atomic radius generally increases as you move down a group in the periodic table. This is because each subsequent element has an additional electron shell, which increases the distance between the nucleus and the outermost electrons. Francium, being at the bottom of Group 1, has the most electron shells, making it the element with the largest atomic radius.
However, it’s important to note that Francium is highly radioactive and extremely rare in nature. Due to its instability, it is challenging to measure its atomic radius accurately. Despite this, based on periodic trends, Francium is considered to have the largest atomic radius among all elements.