Potassium and lithium are Group 1 metals that exist as isotopes.
Complete the table of information about two isotopes of potassium.
| Atomic number | Mass number | Number of protons | Number of neutrons |
|---|---|---|---|
| 19 | 39 | ||
| 19 | 22 |
Potassium and lithium are Group 1 metals that exist as isotopes.
A sample of lithium has this percentage composition by mass:
6Li=7.6%7Li=92.4% ^{6}\text{Li} = 7.6\% \qquad ^{7}\text{Li} = 92.4\% 6Li=7.6%7Li=92.4%Use this information to calculate the relative atomic mass of this lithium sample. Give your answer to two decimal places.
A reaction occurs when a small piece of potassium is added to water in a trough. State two observations that could be made during the reaction.
A few drops of universal indicator are added to the liquid in the trough at the end of the reaction. A colour change occurs.
State the final colour of the liquid in the trough.
A few drops of universal indicator are added to the liquid in the trough at the end of the reaction. A colour change occurs.
Give the formula of the ion formed during the reaction that causes this colour change.
The electronic configurations of lithium and potassium are
Li2,1K2,8,8,1 \text{Li} \quad 2,1 \qquad \text{K} \quad 2,8,8,1 Li2,1K2,8,8,1Explain why potassium is more reactive than lithium.
