Hemet High • Chemistry Name Pd  The Periodic Law Ch Worksheet

Hemet High • Chemistry Name____________________________Pd___

5  The Periodic Law

Ch 5.1 Worksheet

____ 1. In the modern periodic table, elements are ordered

1. 
   
   

2. 
   According to decreasing atomic mass.
   
3. 
   According to Mendeleev’s original design.
   
4. 
   According to increasing atomic number.
   
5. 
   Based on when they were discovered.
   

____ 2. Mendeleev noticed that certain similarities in the chemical properties of elements

appeared at regular intervals when the elements were arranged in order of increasing

1. 
   
   

2. 
   Density.
   
3. 
   Reactivity.
   
4. 
   Atomic Number.
   
5. 
   Atomic Mass.
   

____ 3. The modern periodic law states that

1. 
   No two electrons with the same spin can be found in the same place in an atom.
   
2. 
   The physical and chemical properties of an element are functions of its atomic number.
   
3. 
   Electrons exhibit properties of both particles and waves.
   
4. 
   The chemical properties of elements can be grouped according to periodicity, by
   

physical properties cannot.

____ 4. The discovery of the noble gases changed Mendeleev’s period table by adding a new

1. 
   
   

2. 
   Period
   
3. 
   Series
   
4. 
   Group
   
5. 
   Level
   

____ 5. The most distinctive property of the noble gases is that they are

1. 
   
   

2. 
   Metallic
   
3. 
   Radioactive
   
4. 
   Metalloid
   
5. 
   Largely unreactive
   

____ 6. Lithium, the first element in Group 1, has an atomic number of 3. The second element

in this group has an atomic number of

1. 
   
   

2. 
   4
   
3. 
   10
   
4. 
   11
   
5. 
   18
   

7. An isotope of fluorine has a mass number of 19 and an atomic number of 9.

____ a. How many protons are in this atom?

____ b. How many neutrons are in this atom?

____ c. What is the nuclear symbol of the fluorine atom, with its mass number & atomic number?

8. Samarium, Sm, is a member of the lanthanide series.

_______________________ a. Identify the element just below samarium in the periodic table.

_______________________ b. By how many units do the atomic numbers of these two elements differ?

9. A certain isotope contains 53 protons, 78 neutrons, and 53 electrons.

_______________________ a. What is its atomic number?

_______________________ b. What is the mass number of this atom?

_______________________ c. What is the name of this element?

_______________________ d. Identify two other elements that in the same group as this element.

10. In a modern periodic table, every element is a member of both a horizontal row and a vertical

column. Which one is the group, and which one is the period?

11. Explain the distinction between atomic mass and atomic number of an element.



12. In the periodic table, the atomic number of I is greater than that of Te, but its atomic mass is

less. This phenomenon also occurs with other neighboring elements in the periodic table.

Name two of these pairs of elements.



Hemet High • Chemistry Name____________________________Pd___

5  The Periodic Law

Ch 5.2 Worksheet

1. Identify the element and write the noble-gas notation for each of the following:

a. The Group 14 element in Period 4

b. The only metal in Group 15

c. The transition metal with the smallest atomic mass

d. The alkaline-earth metal with the largest atomic number

2. Give the symbol, period, group, and block for the following:

a. sulfur



b. nickel



c. [Kr]5s¹



d. [Ar] 4s¹3d⁵



3. There are 18 columns in the periodic table; each has a group number. Give the group numbers

that make up each of the following blocks:

a. s block

b. p block

c. d block


4. On the periodic table above, several areas are labeled with letters A-H.

a. Which block does A represent, s, p, d, f?

b. Identify the remaining labeled areas of the table, choosing from the following terms: main-group elements, transition elements, lanthanides, actinides, alkali metals, alkaline-earth metals, halogens, noble gases.

B

C

D

E

F

G

H