1. PERIODIC TABLE OF ELEMENT
Structure Question
1 Diagram 2.1 shows the Periodic Table of elements. The letters P, Q and U do not
represent the actual symbols of the elements.
1 2 13 14 15 16 17 18
1 P
2
3 Q U
4
5
6
FIGURE 2.1
(a) Table 2.2 shows one characteristic for each of elements R, S and T.
Element Chracteristic
R Located in Period 2 and has 6 valency electrons
S Has electron arrangement 2.8.8.1
T Has a duplet in the only electron shell
Table 2.2
Referring to Table 2.2, indicate the positions of R, S and T by writing the letters in
the correct boxes of the above Periodic Table.
[3 marks]
(b) Which element among P, Q, R, S, T and U, exists as a monoatomic gas?.
……………………………………….. .......................................................................
[1 mark]
(c) Both Q and S react with cold water to produce hydrogen gas.
(i) Which element reacts more vigorously ?
………………………………………..........................................................................
[1 mark]
(ii) Write the balanced chemical equation for the reaction in c(i).
…………………………………………......................................................................

2. [1 mark]
d) When U dissolves in water, it produces a mixture of two acids.
(i) Write the formulae for these two acids.
…………………………………………………………………………………….
[1 mark]
(ii) Describe the observation obtained when a piece of litmus paper is immersed in the
mixture of two acids?
……………………………………………………………………………………..
[1 mark]
e) P can react with R to produce a liquid. Name the liquid.
………………………………………………………………………………………...
[1mark]
f) Classify the elements P, Q, R, S, T and U into metals and non-metals.
Type of element Elements
Metal
Non-metal
[2 marks]

3. JAWAPAN
1 (a)
1 2 1 1 1 1 1 1
3 4 5 6 7 8
1 P T
2 R
3 Q U
4 S
5
1+1+1
6
(b) T 1
1
(c)(i) S 1
(ii) 2Q + 2H2O  2QOH + H2 // 2S + 2H2O  2SOH + H2 1
2
(d)(i) HU dan HUO atau HCl dan HClO/HOCl 1
(ii) Warna kertas litmus dilunturkan/biru / merah menjadi putih 1
2
(e) Air 1
1
(f) Logam: Q, S
Bukan logam: P, R, T, U
Catatan : Semua betul – 2 markah
Mana-mana 4 betul – 1 markah 2
JUMLAH 11

4. 2. Figure 1 show a part of the periodic table.
1 2 13 14 15 16 17 18
1
2 P Q
3 R S T
4
5
6
Figure 1
Based on the Figure 1, answer the following questions.
(a) What is the element represented by P?
............................................................................................ (1 marks)
(b) On the figure above, mark X in the box for an alkali metal
........................................................................................... (1 marks)
(c) State one characteristic of element U.
.......................................................................................... (1 marks)
(d) Write the electron arrangement for S.
......................................................................................... (1 marks)
(e) (i) Which element is not chemically reactive?
.................................................................................. (1 marks)
(ii)State one application of the element in (e)(i)
................................................................................. (1 marks)
(f) (i) Write the chemical equation for the reaction between R and Q
................................................................................. (1 marks)
(ii)State briefly the transfer of electron which occur during the reaction
between R and Q.
..........................................................................................
......................................................................................... (2 marks)
JAWAPAN
1 (a) Carbon 1
(b) (any box in column for group 1) 1
(c) Form coloured compounds 1
(d) 2.8.7 1
(e) (i) T 1
(ii) Fill electric bulb 1
(f) (i) 2R + Q2 2RQ 1
(ii) - R release two electrons to Q 1
- Q receive two electron from R 1
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5. ESSAY QUESTION
1 (a) Figure below shows the positions of elements Na, P and Cl in the Periodic
Table of Elements.
1 2 13 14 15 16 17 18
1
2
3 Na P Cl
4
5
6
i. Arrange the element, Na, P and Cl according to the size of the atoms that
decrease. Explain your answer. (5 marks)
ii. Arrange the elements Na, P and Cl following their increasing
electronegativity. (4 marks)
iii. State two chemical properties of sodium.
Show the reaction involved. (7 marks)
(b) “Iron is a transitional element.”
State the properties that support the above statement. (4 marks)
JAWAPAN
1 (a) (i) - Na, P, Cl
Decreasing in the size of the atom 1
- Every atom of the element Na, P
and Cl have 3 shell with 1
electrons.
- The nuclear positive charge
increase as the period moves from
left across to the right period. 1
- Therefore the pulling force of the
nucleus on the electrons of the
three shells become stronger from

6. Na, P and Cl. 1
- Because of this, the size of the
atom decrease from Na, P to Cl. 1
(ii) - Na,P,Cl
Increasing electronegativity 1
- The nuclear positive charge
increase from Na to Cl. 1
- The sizeof the atom becomes
smaller from Na to Cl. 1
- Because of its strength, the
nucleus can attract more electrons
by Na to Cl. 1
(iii) 1.Reaction with water
- Sodium react actively with water
and produces a loud pop sound. 1
- A solution which turns red litmus
paper blue is produced. 1
- Equation of the reaction :
2Na + 2H2O  2NaOH + H 1
2. Reaction with oxygen
- Sodium burns quickly with a
bright yellow flame. 1
- A white solid is produced and
dissolves in water. The solution
turns red litmus blue. 1
- Equation of the reaction :
4Na + O2 2Na2O 1
Na2O + H2O  2NaOH 1
(b) - Iron forms a coloured compound
e.g. ferric(III) chloride, which is
reddish brown in colour. 1
- Iron has different oxidation
number. 1
Example: The oxidation number
of iron in ferrous(II) chloride is
+2 while in ferric(III) chloride is
+3. 1
- Iron can form complex ions e.g.
ion [Fe(CN)6]4- 1
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