Physics, 20.08.2019 11:30 Imagine2013
1. who first published the classification of the elements that is the basis of our periodic table today?
2. by what property did mendeleev arrange the elements?
3. by what property did moseley suggest that the periodic table be arranged?
4. “the properties of the elements repeat periodically” defines the
5. what is a period and how many are there in the periodic table?
6. what is a group (also called a family)? how many are there in the periodic table?
7. state the number of valence electrons in the following:
element valence electrons
magnesium
phosphorous
fluorine
neon
8. give the names and chemical symbols for the following:
atomic number element name chemical symbol
13
92
5
25
9. list, by number, both the period and group of each of these elements.
element symbol period group
beryllium be
iron fe
lead pb
10. which of the following pairs of elements belong to the same period? highlight
a. na and cl b. na and li c. na and cu d. na and ne
11. which of the following pairs of elements belong to the same group? highlight
a. h and he b. li and be c. c and pb d. ga and ge
12. what group numbers are the transitions elements?
13. what are the group 1/ia elements called?
14. what are the group 2/iia elements called?
15. what are the group 17/viia elements called?
16. what are the group 18/viiia elements called?
17. which alkali metal belongs to the sixth period?
18. which halogen belongs to the fourth period?
19. what element is in the fifth period and the eleventh group?
20. what is the heaviest noble gas?
21. what is the heaviest alkaline earth metal?
22. would you expect strontium to be, chemically, more similar to calcium or rubidium and why?
23. list the three lightest noble gases.
24. list all of the alkali metals
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