4.0 Module for the Periodic Table of Elements

8/20/2019 4.0 Module for the Periodic Table of Elements

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A. Fill in the blanks with the correct words or phrases .

1. The Periodic table is a method to classify elements based on the ____________________.

2. Elements with the same number of _______________________ are placed in the same

vertical group.

3. Elements having the same number of _____________________ are placed in the same

horizontal line.

4. Name three elements in Group 1 are :

___________________________________________.

5.

Name three elements in Group 18 are : __________________________________________.

6. The reactivity of the elements in Group 1 ______________________ as we go down the

group because ____________________________________________________________.

7. The other name for elements in Group 17 is _______________________.

8. The reactivity of elements in Group 17 __________________________ as we go down the

group .

9. As we move across the Periodic Table from left to right, the radius __________________

and the electronegativity __________________________.

10. As we move across Period 3 , the metallic nature of oxides changes from basic oxides

to ____________________ and finally to ____________________.

11. The special characteristics of transition elements are :

a)

Forms ______________________ ions or compounds.

b) Forms compounds with _____________________ satate.

c) Forms _________________________

d) Can be used as __________________________.


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12. Uses of noble gases:

a) Helium ____________________________________________________

b) Neon : ______________________________________________________

c) Argon :______________________________________________________

d) Krypton : ____________________________________________________

e) Radon : ______________________________________________________

13. Lithium, sodium and potassium react with oxygen to produce a white metallic oxide .

Complete the following chemical equations:

14. a) These metallic oxides dissolves in water to form an alkali . Thus the solution turns

phenolphthalein ___________ in colour.

a) Li2O + H2O

b) Na2O + H2O

c) K 2O + H2O

15. Elements of group 1 react with chlorine to form their metal chlorides :

a) Li (s) + Cl2 (g) b) Na (s) + Cl2(g)

c) K (s) + Cl2(g)

16. Group 17 elements react with water to form acids:

a) Cl2 + H2O

b) Br 2 + H2O c) I2 + H2O

17. Reactions of Halogen with NaOH:

a) Br 2 + NaOH

b) I2 + NaOH

18. Reactions of Halogen with iron:

a) Cl2 + Fe

b) Br 2 + Fe c) I2 + Fe


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B. Objective Questions.

1. The element with a proton number 7 is placed in groupA. 2 B. 5 C. 14 D. 15

2. All the elements in a group have the same features except

A. the same number of valence electronsB. the same chemical properties

C. the same physical properties

D. increasing number of shells as we go down the group.

3. The element Q with proton number 16 is placed in the following position in the Periodic

Table:

Group Period

A 1 2

B 2 3

C 16 3

D 17 2

4. The figure below shows the symbols for two elements, G and K.

Which of the following statement is true of the two elements?A. G is a metal

B. The electron arrangement of K is 2.8.7

C. G and K are placed in the same period.D. G and K forms coloured compounds.

5. Aluminum oxide has both acidic and basic properties , therefore it is

A. a basic oxideB. an acid oxide

C. a metalloid oxide

D. an amphoteric oxide

6. Which of the following elements are in Group 18 of the Periodic Table of elements?

A. Helium and krypton

B. Hydrogen and oxygen

16

G8

35

K17


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C. Oxygen and krypton

D. Helium , hydrogen and oxygen

C. Structural Questions

1. The table below shows the proton number of P, Q, R ,S and T .Based on the table answer the following questions.

Element Proton Number

P 3

Q 8

R 9

S 18

T 19

a) (i) Write the electron arrangement for the element T . [1 mark]

____________________________________________________________________

(ii) Determine the position of T in the Periodic Table of elements [ 1 mark]

_____________________________________________________________________

b) (i) Write the chemical equation of the reaction between Q and water [ 3 marks]

_____________________________________________________________________

(ii) What is observed when a piece of red litmus paper is placed in the water?

[ 1 mark]

_____________________________________________________________________

c) Name the elements that are placed in the same group in the Periodic table of elements.

[1 mark]

______________________________________________________________________

d) Which element is known as a noble gas ? [1 mark]

______________________________________________________________________

e) Noble gases are chemically unreactive . State the reason for this property. [1 mark]

______________________________________________________________________


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(e) Why are the elements Q and R placed in the same Period? [1 mark]

(f)

When T is placed in a beaker of water, a gas is evolved. Name the gas formed. [1 mark]

(g) What is the name of the group of elements where Z is placed? [1 mark]

_____________________________________________________________

h)

Based on the above information, which gas is more suitable to be used in

meteorological balloons? Give one reason . [1 mark]

_______________________________________________________________

_______________________________________________________________

3. Figure 2 shows the reaction between sodium and chlorine.

a) State two observations when a small piece of burning sodium is lowered into a

gas jar of chlorine gas. [2 marks]

________________________________________________________________

b) Write a balanced chemical equation to represent the reaction in (a) above.[3 marks]

Hydrogen gas

light

flammable

colourless

Helium gas

light

not reactive

colourless

Chlorine gas

sodium

Gas jar


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_________________________________________________________________

c) What would you observe if the sodium is replaced with potassium? [1 mark]

_________________________________________________________________

d) From your observation in (c) above what is the conclusion that you can make withregard to reactivity of sodium and potassium?

[1 mark]

__________________________________________________________________

__________________________________________________________________

D. Practical Question

1. Chlorine , Bromine and iodine are halogens. They react with iron with differient

intensities. You are required to plan an experiment to show that the reactivity ofhalogens decrease when descending down the group by comparing their reactions with

iron. Your description should include:

a) Aim b) Hypothesis

c) All variables

d) Apparatus and Materialse) Procedure

f) Tabulation of data. [18 marks]

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4.0 Module for the Periodic Table of Elements