20. analyze and interpret the data in the table below. which prediction about the element francium is…

20. analyze and interpret the data in the table below. which prediction about the element francium is true?\nalkali metals data\n| element | melting point (°c) | boiling point (°c) | radius (pm) |\n|--|--|--|--|\n| lithium | 180.5 | 1342 | 152 |\n| sodium | 97.8 | 882 | 186 |\n| potassium | 63.4 | 759 | 227 |\n| rubidium | 39.3 | 688 | 248 |\n| cesium | 28.4 | 671 | 265 |\n| francium |? |? |? |\nfrancium will have the lowest melting point and the largest radius of all the alkali metals.\nfrancium will have the highest melting point and the largest radius of all the alkali metals.\nfrancium will have a lower boiling point and a smaller radius than lithium.\nfrancium will have a higher melting point and a lower boiling point than the other alkali metals.

20. analyze and interpret the data in the table below. which prediction about the element francium is true?\nalkali metals data\n| element | melting point (°c) | boiling point (°c) | radius (pm) |\n|--|--|--|--|\n| lithium | 180.5 | 1342 | 152 |\n| sodium | 97.8 | 882 | 186 |\n| potassium | 63.4 | 759 | 227 |\n| rubidium | 39.3 | 688 | 248 |\n| cesium | 28.4 | 671 | 265 |\n| francium |? |? |? |\nfrancium will have the lowest melting point and the largest radius of all the alkali metals.\nfrancium will have the highest melting point and the largest radius of all the alkali metals.\nfrancium will have a lower boiling point and a smaller radius than lithium.\nfrancium will have a higher melting point and a lower boiling point than the other alkali metals.

Answer

Explanation:

Step1: Observe trends in data

As we move down the alkali - metal group from lithium to cesium, the melting point decreases (180.5°C for Li to 28.4°C for Cs) and the atomic radius increases (152 pm for Li to 265 pm for Cs).

Step2: Predict for francium

Francium is below cesium in the alkali - metal group. So, following the trends, it will have the lowest melting point and the largest radius among all alkali metals.

Answer:

Francium will have the lowest melting point and the largest radius of all the alkali metals.