Sir J.J. Thomson and others contributed to the discovery of isotopes and the structure of the atom.
Explain which block in the Periodic Table neon belongs to.
A sample of neon, Ar=20.180A_r = 20.180Ar=20.180, is found to consist of three isotopes. The accurate relative isotopic masses and % abundances of two of the isotopes are shown in the table:
| Isotope | Relative isotopic mass | % abundance |
|---|---|---|
| 20Ne^{20}\text{Ne}20Ne | 19.99219.99219.992 | 90.48%90.48\%90.48% |
| 21Ne^{21}\text{Ne}21Ne | 20.99420.99420.994 | 0.27%0.27\%0.27% |
Determine the relative isotopic mass of the third isotope of neon, 22Ne^{22}\text{Ne}22Ne, in the sample. Give your answer to 5 significant figures.
A student adds potassium oxide to water in a test tube. In a separate test tube, the student adds magnesium oxide to water.
Write the equation for the reaction of potassium oxide with water. State symbols are not required.
Suggest the approximate pH of the two solutions formed in the test tubes.
