Deduce how many electrons and neutrons are in the samarium atom shown.
Samarium shows properties similar to those of transition elements. Choose the one correct statement about samarium.
Complete Fig. 5.1 by drawing the apparatus to show how the volume of hydrogen gas is measured while this reaction takes place.
Describe the change in the rate of reaction when hot water is used.
Describe the change in the rate of reaction when powdered samarium is used.
Arrange the four metals in order of reactivity. Put the least reactive metal first.
Samarium reacts with oxygen to form samarium oxide, $\text{Sm}_2\text{O}_3$. Complete the symbol equation for this reaction. $[BLANK]\text{Sm} + 3\text{O}_2 \rightarrow [BLANK]\text{Sm}_2\text{O}_3$
Define what is meant by hydrated.
State two physical properties that an ionic compound has.