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
Answers: 1
Other questions on the subject: Physics
Physics, 22.06.2019 14:30, samone26
Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates
Answers: 3
Physics, 22.06.2019 15:30, bloodry
Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples
Answers: 1
Physics, 22.06.2019 18:00, RyannLambertt7141
Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.
Answers: 1
Physics, 22.06.2019 18:50, jtsizemore
An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?
Answers: 2
Do you know the correct answer?
1. who first published the classification of the elements that is the basis of our periodic table to...
Questions in other subjects:
Mathematics, 12.07.2019 11:30
Mathematics, 12.07.2019 11:30
English, 12.07.2019 11:30
