What order of reactivity NOT activity are the metals Barium Lithium Radium and Sodium in?

Answer 1

The metals listed are all alkali metals or alkali-earth metals. The periodic trend for these groups is: as you move down the group/family, reactivity increases. The alkali metals will be more reactive than the respective alkali-earth metals.

Sodium and lithium are alkali metals, so you can organize them first. Sodium is further down in the family than lithium, so we can say that sodium is the most reactive out of the group, followed by lithium. Then we have barium and radium left. Radium is slightly more reactive than barium due to its position, so it is third and barium is fourth.

Answer 2

The order of reactivity in these metals from least reactive to most reactive is: Barium, Radium, Sodium, Lithium. This is based on their tendency to lose electrons and form positive ions in chemical reactions. Barium and Radium are less reactive compared to Sodium and Lithium due to having a larger atomic size and higher electron shielding, making it harder for them to lose electrons.