Chemistry. Unit 3. Assignment 1. Name:
1. In 1871, Russian chemist _________________________ created the forerunner of the modern
periodic table
2. List four things, other than name and symbol, one can discover about an element using a periodic table
a. _____________________________
b. _____________________________
c. _____________________________
d. _____________________________
3. How can the periodic table be used to predict the properties of the elements?
4. Is the following sentence true or false? The subatomic particles that play the most significant role in
determining the physical and chemical properties of an elements are its valence electrons. _________
5. Complete the table about classifying elements according to their electron configurations.
| Category | Description of Electron Configuration | Group |
| Noble gases | ||
| Main group elements | ||
| valence s orbitals and (n-1) d orbitals contain electrons | Group B elements | |
| valence s orbitals and (n-2) f orbitals contain electrons | Group B elements |
Match the category of elements with an element from that category
6. _____ Noble gases a. uranium
7. _____ Chalcogens b. sodium
8. _____ Halogens c. argon
9. _____ Transition Metals d. chlorine
10. ____ Actinide series e. silver
11. ____ Lanthanide series f. germanium
12. ____ Metalloids g. calcium
13. ____ Alkali metals h. ruthenium
14. ____ Alkaline Earth metals i. sulfur
15. ____ "Coinage" metals j. holmium
16. Which elements would have the 4p as their valence shell?_______________________________________
17. How many electrons can each type of subshell (orbital types) hold? ________________________________
_____________________________________________________________________________________
Write electron configurations for the following.
18. magnesium:
19. silver:
20. chloride ion (Cl-1):