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Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.1 - The Scientists (1 page)

The List of Scientists (Can be used more than once) Johann Dobereiner John Newlands Dimitri Mendeleev Henry Moseley Glenn Seaborg

John Dalton J.J. Thomson Neils Bohr Erwin Schrodinger

Write the name of the scientist by his contribution….. 1. Who performed the Cathode Ray Tube Experiment?

2. Electrons were in energy levels. The further an electron was from the nucleus, the higher its energy.

3. Arranged the elements according to

4. Recognized the relationship between properties of “triads” of elements and their atomic mass.

5. Postulated the quantum (wave) mechanical model

6. The atom as mostly space and that all of the positive charge was located in a very small central nucleus

7. Synthesized transuranic elements

8. Published a version of the that was arranged according to atomic mass. wisely included blanks for unknown elements that I predicted would be discovered 9. Elements were arranged according to atomic mass that every 8th element seemed to have similar properties

10. “Billiard Ball” theory

11. Discovered that electrons were negative?

12. Who developed the first theory of the atom?

13. Who developed the planetary model?

14. Who performed the Foil Experiment?

15. Who developed the Plum Pudding Model?

16. List the conclusions made from the Gold Foil Experiment.

90% of a worksheet must be completed to earn credit for that worksheet! Page 1 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.2 – Element Search (1 page)

Use a highlighter or a pen to find the full names of the following elements. Try it without a periodic table first to check your knowledge of symbols and names!

SYMBOL SYMBOL SYMBOL SYMBOL SYMBOL SYMBOL Al Ca He Hg Se Xe Sb C H Ne Si Zn Ar Cs I Ni Ag As Cl Fe N Na Ba Cr Kr O Sr Be Co Pb P S B Cu Li Pt Sn Br F (be careful!) Mg K W Cd Au Mn Rn U

M U I T N O R T S E L E N I U M Z C G X E N O N A A C M K X A A N S U I N A R U Z A O U Y X O I H Y G A O Y C A D M I U M S X I R L L P L T I C Y K O N N G E K U O E N I R O L H C M Z P D A K D L O G E K M I M N N C X I Z L C I U B I E A E R R I A X S U T U N G S T E N Y P U I R G I R L O K R N C N I Z N O N E Z L K R Y M S A N E G E G Z O E I U M U I N A R U Y A E R E S C E D O M E E N S S P O C M E N I M O R B K R A O G A N O N B N E E X R D U N F Y M Y B K E R T B O K K N M O S P Y T H F L I T H I U M N B S O A R E O I U R G G E L C E A T E T B Y I O A C P L T C D N N O E O D R A U E L E I O R N T R I Z T I A E R I N E N I D O I I N U L U U D P I N S L N D R A T N D R U F L U S M V O N C E Y U E I X P N P K A C E S I U M R S I L V E R N R M S O D I U M L L Y E N I R O U L F R A H E A K C R S I R H C U P H O S P H O R U S Y N O M I T N A A R U S I K

90% of a worksheet must be completed to earn credit for that worksheet! Page 2 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.3 – The Periodic Table (1 page)

Match each element in Column A with the best matching description(s) from Column B.

COLUMN A COLUMN B 1. ______strontium A.

2. ______chromium B.

3. ______iodine C. alkaline earth

4. ______nitrogen D.

5. ______argon E.

6. ______rubidium F. representative element

7. ______silicon G. transition element

Give the correct symbol for each element described by the following:

8. Noble gas in the third 9. 14 element in the fourth period 10. Halogen in the second period 11. Group 4 element in the fifth period 12. Alkali metal in sixth period 13. Group 13 element in fourth period 14. Group 11 element in sixth period 15. in the second period

1. Properties of elements are most similar to other elements — A. in the same group C. with the same number of neutrons B. in the same period D. with a smaller atomic mass

2. Which of the following is a NOT property of metal? A. tend to be malleable C. have high melting points B. have low boiling points D. are conductors of electricity

3. An unknown element found at a crime scene has the following characteristics: It is a solid, it does not conduct electricity, and becomes a powder when ground. What type of element is this substance? A. Metal C. Non-metal B. Semimetal D. Halogen

4. In which set do the elements exhibit the most similar chemical properties? A. Li, Na, and K C. Hg, Br, and Rn B. N, O, and F D. Al, Si, and P

5. An unknown element has the following characteristics: it is malleable, readily forms alloys, is not very reactive, and conducts electricity. What type of element is this substance? A. Alkali metal C. B. Semimetal D. Alkaline earth metal

90% of a worksheet must be completed to earn credit for that worksheet! Page 3 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.4 – Components of the Atom (2 pages)

1. Define an : 2. How do of the same element differ in the following: a. mass b. number of protons c. number of neutrons? d. number of electrons? 3. has two isotopes: neon-20 and neon-22 a. Which isotope has the greater mass? _____ c) Which isotope has more protons? ______b. Which isotope has more neutrons? _____ d) Which isotope has more electrons? ______

ATOMIC MASS CALCULATIONS: If specific masses are given for the isotopes, use the specific masses. If no specific masses are given, you are allowed to use the mass numbers for the mass of the isotope.

4. A natural sample of consists of two isotopes. One has an exact mass of 10.0129 amu and its percent abundance is 19.91%. The other isotope of mass 11.0093 amu, has a percent abundance of 80.09%. Calculate the atomic mass. (10.811 amu)

5. Calculate the percent abundances of -63 and copper-65 if the atomic mass is 63.546 amu and the exact masses of the isotopes are 63Cu = 62.93 amu nd 65Cu = 64.93 amu. Assume no other isotopes exist. (63Cu = 69.2% and 65Cu = 30.8%)

6. is found in nature combined with to give sane, quartz, agate, and similar materials. The element has three stable isotopes. Calculate the atomic mass. (28.1 amu)

Exact Mass % Abundance 27.97693 92.23 28.97649 4.67 29.97376 3.10

7. Naturally occurring consists of two isotopes, 6Li and 7Li, and has an atomic mass of 6.941 amu. Which isotope is more abundant? What are the percent abundances of the two lithium isotopes? Their masses are 6.01512 and 7.01600, respectively. (more 7Li, 6Li 7.49% and 7Li 92.51%)

90% of a worksheet must be completed to earn credit for that worksheet! Page 4 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.4 – Components of the Atom (continued)

8. Naturally occurring has two isotopes. Isotope A has a relative mass of 106.9051 and an abundancy 51.82%. Isotope B has a relative mass of 108.9047. Calculate the atomic mass of silver from this data. (107.87 amu)

Answer the following questions:

_____1. The 2+ ion for (#23) would have how many electrons?

_____2. The 3- ion atomic number 15 would have how many electrons?

_____3. The 1+ ion of (#19) would have how many electrons?

_____4. How many protons would the 3+ ion of aluminum (#13) have?

_____5. What would be the ratio of protons to electrons in the 1- ion of (#17)?

_____6. How many MORE electrons than protons would the 2- ion of (#34) have?

-1 _____7. The nuclear symbol for an unknown ion is 53 X . What element are we talking about here?

_____8. How many electrons are there in the 1+ ion of Cs-136 (#55)?

_____9. How many neutrons?

_____10. How many neutrons are there in an atom of -60 (#27)?

_____11. How many neutrons are there in the 3- ion of As-71 (#33)?

_____12. How many protons are there in the 2+ ion of Pb-210 (#82)? How many electrons? How many neutrons?

_____13. What information does the term Sr-80 provide?

_____14. Which is heavier U-234 or U-238? How do you know?

102 +3 _____15. How many neutrons are in 45 Rh ?

_____16. An oxygen atom undergoes a reaction to gain two electrons to form an ion. What is the charge of the newly formed oxygen ion?

_____17. Mystery element J has a charge of -3, 16 neutrons, and 18 electrons. What is the nuclear symbol for ion J?

90% of a worksheet must be completed to earn credit for that worksheet! Page 5 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______WKS 4.5 – Nuclear Symbol (1 page)

These may be fictitious isotopes. They are intended to help you practice and think only.

Atomic # Mass # # e- # n0 #p+ charge nuclear atom or symbol ion 1 17 19 0 2 182 71 109

3 38 46 40 4 92 238 86

5 45 34 -2

6 113 46 48 7 21 42 0

8 80 126 83

9 116 49 +3 10 128 53 -1

210 +5 11 83 Bi

48 12 22 Ti

80 -2 13 34 Se

64 +2 14 30 Zn

120 +4 15 50 Sn

90% of a worksheet must be completed to earn credit for that worksheet! Page 6 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.6 – Review (1 page)

1. Name two elements in the same group as oxygen ______

2. Name two elements in the same period as ______

3. Fill out the following chart over the atom:

Charge Location If I change the number of this particle, what happens?

Proton

Neutron

Electron

4. Out of the 3 sub-atomic particles (proton, neutron, and electron), which two are approximately the same size?

5. Out of the 3 sub-atomic particles (proton, neutron, and electron), which is the smallest?

6. If an atom is neutral, the number of protons is ______to the number of electrons.

7. Define Ion. When do we have a positive charge? When do we have a negative charge? (Think in terms of #p+ versus #e-.)

Define the following terms. For the first three, indicate whether or not the number is found on the periodic table.

TERM DEFINITION ON PERIODIC TABLE? atomic number mass number atomic mass. cation anion isotope

8. Out of the three definitions (atomic number, mass number, and atomic mass), which can be used to identify which element you have?

9. What is the formula for calculating average atomic mass?

90% of a worksheet must be completed to earn credit for that worksheet! Page 7 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.7 – Review Containued (1 Page)

1. Naturally occurring boron is 80.20 % boron-11 and 19.80 % boron-10. Calculate the average atomic mass.

2. Define isotope.

3. In hyphen notation (ex: -14), what does the number (14) stand for?

35  4. Write the chemical configuration ( 17 Cl ) for the following: a. atomic number 47, mass number 107, +1 charge

b. 81 protons, 123 neutrons, 81 electrons

c. 54 electrons, mass number 137, +2 charge

d. atomic number 35, 39 neutrons, -1 charge

e. atomic number 13, mass number 26, 10 electrons

5. How many protons are in Carbon-14? How many neutrons are in Carbon-14?

6. What are the nicknames for each of the following groups? a. Group 1 b. Group 2 c. Groups 3-12 d. Group 17 e. Group 18

7. On the Periodic table below, mark the following things: a. Location of the alkali b. Location of the alkaline earth metals c. Location of the d. Location of the noble gases e. Location of transition metals f. Location of g. Location of the h. Location of the

90% of a worksheet must be completed to earn credit for that worksheet! Page 8 of 9 Pre-AP Chemistry Unit 4 HW Packet Name ______

WKS 4.8 – Periodic Table Review (1 page) A chem-“mystery” “table”

Dmitri Mendeleev developed a chart-like arrangement of the elements called the ______(1). He stated that if the elements were listed in order of increasing ______(2), their properties repeated in a regular manner. He called this the ______(3) of the elements. The arrangement used today differs from that of Mendeleev in that the elements are arranged in order of increasing ______(4). Each horizontal row of elements is called a(n) ______(5). Each vertical column is called a(n) ______(6), or, because of the resemblance between elements in the same column, a(n) ______(7).

In rows 4 through 7, there is a wide central section containing elements, each of which is called a(n) ______(8). Rows 6 and 7 also contain two other sets of elements that are listed below the main chart. These are called the ______(9) and the ______(10), respectively. Each of these elements, as well as those in the first two columns at the left end of the chart, is classified as a(n) ______(11). Each of the elements at the right side of the chart is classified as a(n) ______(12). Each of the elements between these two main types, having some properties like one type and other properties like the other type, is called a(n) ______(13).

Each of the elements in the column labels 1 is called a(n) ______(14). Each of the elements in column 2 is called a(n) ______(15). Each of the elements in column 17 is called a(n) ______(16). Each of the elements in column 18 is called a(n) ______(17). Because they do not react readily we call them (18).

Word List Matched blank series 1. Alkali metal 2. Alkaline earth metal 3. Atomic mass 4. Atomic number 5. Family 6. Group 7. Halogen 8. Inert 9. series 10. Metal 11. Metalloid 12. Noble gas 13. Non-metal 14. Period 15. Periodic law 16. Periodic table 17. Transition element 18.

90% of a worksheet must be completed to earn credit for that worksheet! Page 9 of 9