Name Date Class

(

~ Directed Reading for

-==- Content Mastery

OverviewProperties of Atoms and thePeriodic Table

Directions: Complete the concept map using the terms in the list below. Terms can be used more than once,

protons periodic table electrons neutrons

.---------,

and

have a massnumber equal to

the sum of

.---- -'-- -"'-------~,/ 6. \

( )",,~- .~_/

-----._------~ ..

./

are organizedas elements in the

and

and

are made up of

UEvi

'"C'"ClEo(,)

,

Directions: complete the following sentences by underlining the correct words in parentheses,7. An element is matter that is composed of one type of (atom/quark).

8. The unit of measurement used for atomic particles is the

(atom size/atomic mass unit),

9. Atoms of the same element that have different numbers of neutrons are called

(isotopes/electron clouds),

10. In the periodic table, elements are arranged by increasing atomic (power/number).

11. An electron dot diagram uses the symbol of an element and dots to represent

the (quarks/electrons) in the outer energy level.

Properties of Atoms and the Periodic Table 19

Sedion 1 • Structure of theAtom

Sedion 2 • Masses of Atoms

Name Date Oass

. (

electron cloud

six protonsisotopes

quarks

Directions: Use the terms below to complete the following paragraphs about atoms, atomic mass, andisotopes. Terms may be used more than once.

six number electrons

neutron(s) proton(s) mass

The electron has vcry little mass compared to the 1. or

2. . The mass of the atom depends on the nucleus and how

many 3. and 4. it has. The sum of the

protons and neutrons is the mass 5. of an atom. The number

of neutrons in an atom can be found by subtracting the atomic number from the

6. number. The mass of the atom is so small that there is a

measure called the atomic 7. unit designated by amu.

8. and 9. make up the nucleus and are made up

of 10. . There are 11. uniquely

different quarks. 12. are found in an area around the nucleus called

the 13. . The nuclei of all atoms of a given element always have the

same number of 14. "They will also have the sanle number of

15. around the nucleus. Some atoms may have more or fewer

16. than will other atoms of the same element. Atoms of the same

•

element with different numbers of neutrons are called 17. "Everyc:c;;,

atom of carbon must contain 18. but some contain six neutrons and-------

others have eight neutrons.

•20 Properties of Atoms and the Periodic Table

Name Date Oass

_ Directed Reading for

-==- Content Mastery

Section 3 • The PeriodicTable

Periodic Table of the Elements

Rare-Earth Elements

a. _

i~II~'~i~!~IO~ ~'~i~I~:~I~I'~I~C",OUfl" ~f~ Ntoavmouir.lf''U'ro8Itlourr.ISBrMnlJm I:.~ OOiKUlJm T~ l~i~ I Erbium 1 TIdlJ1'l . Yn6f'buw i l..uteoon',04 l1:i I 14(} 90fl U424. i 14-4 ~t~ I 150.Jf I !5\.96fo 1~L"5 tS".!I2~ Hi? 5(; I 164 1t1 Hi726 !6$.93-I 173~' 17<1.%7

_~__... 9C; q, 9'1, 93 I 94 95 9f' 97. 9A ~J. 100 . 101 I 102 1O~

Y; Th i Pa U II Np I Pu Am! em Bk I Cf I Es I Fm : Md I No i Lr°

1lhonom Ip~.m UIlV'lflIl1 N«l'fUnillT1 1 P1I,.,lontum Amenoun\ (.Ul1r.Jn1 I k8rttellUm jCaldomun Ej~~\l HofrnlUtl"~N~ jL-...-232.038 j ~,Jl036 ! ~~~ 7..J7o.tS ; 244~ 24..1061 247070 124'.010, 25L(Jfk; J52.(I8.1! ?:"7tY.v..~ Z~,!?Il)l 2601~>

ActinideSenes

Lanthan,deSeries

b. _

Directions: Use the periodic table above to answer the following questions.

1. List two types of information that are given in each box of this periodic table.

2. In this table, where are the metals located? _

3. Where are the nonmetals located? _

4. "\That are the elements in Groups 3 through 12 called? _

5. \rVhat are the elements called that are next to the stairstep-shaped line on the

right side of the table? _

6. What do we caU the letter or letters that represents an element?

( ,>-

..;;;<Ii

'"C'"Cl.

E0u

z~

'"<3'-'::;:.,£0c00v,

Uttl

I~roSu;;,

'"'"~"5Q

~

&'"(J

7. How many elements are included in the modern periodic table? _

8. What name is given to the elements in Group IS? _

Properties of Atoms and the Pfliodi< Table 21

, (

ClassDate

_ Directed Reading for

- Content Mastery

Name

Key TermsProperties of Atoms and thePeriodic Table

Directions: Match the term in Column /I with the definition in Column I. Write the letter of the correct term inthe blank at the left.

Column I Column II

1. sum of the number of protons andneutrons in the nucleus

2. region around the nucleus where theelectrons are found

3. positively charged center of an atom

4. vertical coluTIln in the periodic table

5. neutral particles in the nucleus of an atom

6. weighted average mass of the mU1:ure ofits isotopes

7. positively charged particles in an atom

8. table of the elements arranged accordingto repeated changes in properties

9. represents the electrons in the outerenergy level of an element

__ 10. negatively charged particles in an atom

____ 11. atoms of the same element that havedifferent numbers of neutrons

__ 12. number of protons in an atom's nucleus

__ 13. horizontal row in the periodic table

____ 14. smallest known particle that makesup protons and neutrons

__ 15. the smallest peice of matter that stillretains the properties of the element

__ 16. developed an early periodic chart

_____ 17. approximately 1.67 x IO-24g

a. nucleus

b. electrons

c. protons

d. neutrons

c. quark

f. atomic numher

g. mass number

h. isotope

i. average atomic mass

j. electron cloud

k. periodic table

I. atom

m. atomic mass unit

n. group

o. electron dot diagram

p. period

q. Dmitri Mendeleev

• !'.

.svi~roa.E0

(.)

i:~

<5"2~

'0c

"if,;;:is

'"I~

<5"~q;0

"C<II(3()

J:""-~u0u,

22 Properties of Atoms and the Periodic Table