Adapted by Nelson Nuñez-Rodriguez
Conditions of Use:
Unless otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Chapters derived from:
By David W. Ball
Attribution-NonCommercial-ShareAlike
CC BY-NC-SA
Click on the printer icon at the bottom of the screen
Make sure that your printout includes all content from the page. If it doesn't, try opening this guide in a different browser and printing from there (sometimes Internet Explorer works better, sometimes Chrome, sometimes Firefox, etc.).
If the above process produces printouts with errors or overlapping text or images, try this method:
Click here to return to Chapter 4
| QUESTION | ANSWER | |||||||||||||||||||||
|
1. How many electrons does it take to make the mass of one proton? |
1. about 1,800 electrons |
|||||||||||||||||||||
|
3. Dalton’s initial version of the modern atomic theory says that all atoms of the same element are the same. Is this actually correct? Why or why not? |
3. It is not strictly correct because of the existence of isotopes. |
|||||||||||||||||||||
|
5. Give complete atomic symbols for the three known isotopes of hydrogen. |
5. , and |
|||||||||||||||||||||
|
7. Use its place on the periodic table to determine if indium, In, atomic number 49, is a metal or a nonmetal. |
7. It is a metal. |
|||||||||||||||||||||
|
9. Americium-241 is a crucial part of many smoke detectors. How many neutrons are present in its nucleus? |
9. 146 neutrons |
|||||||||||||||||||||
|
11. Determine the atomic mass of ruthenium from the given abundance and mass data.
|
11. 101.065 u |
|||||||||||||||||||||
|
13. One atomic mass unit has a mass of 1.6605 × 10−24 g. What is the mass of one atom of sodium? |
13. 3.817 × 10−23 g |
|||||||||||||||||||||
|
15. One atomic mass unit has a mass of 1.6605 × 10−24 g. What is the mass of one molecule of H2O? |
15. 2.991 × 10−23 g |
|||||||||||||||||||||
|
17. From their positions on the periodic table, will Cu and I form a molecular compound or an ionic compound? |
17. ionic |
|||||||||||||||||||||
|
19. Mercury is an unusual element in that when it takes a 1+ charge as a cation, it always exists as the diatomic ion.
|
19.
|
|||||||||||||||||||||
|
21. The uranyl cation has the formula UO22+. Propose formulas and names for the ionic compounds between the uranyl cation and F−, SO42−, and PO43−. |
21. uranyl fluoride, UO2F2; uranyl sulfate, UO2SO4; uranyl phosphate, (UO2)3(PO4)2 |