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Chemistry Form 4 • MODULE

(ii) State a pair of isotope in the diagram shown / Nyatakan sepasang isotop dalam rajah yang ditunjukkan.
P and S
(iii) Give reason for your answer in (e)(ii) / Berikan sebab bagi jawapan di (e)(ii).
Atom P and S have same proton number but different nucleon number//number of neutron

(f) An isotope of R has 8 neutron. Write the symbol for the isotope R.
Isotop bagi atom R mempunyai 8 neutron. Tuliskan simbol bagi isotop R.
14 R
6

3 The table below shows the number of proton and neutron of atoms of elements P, Q and R.
Jadual di bawah menunjukkan bilangan proton dan neutron bagi atom unsur P, Q dan R.

Element Number of proton Number of neutron
Unsur Bilangan proton Bilangan neutron
P 1 0
Q 1 1
R 6 6
(a) Which of the atoms in the above table are isotope? Explain your answer.
Berdasarkan jadual di atas, atom yang manakah merupakan isotop? Terangkan jawapan anda.
P and Q. Atom P and Q have same number of proton but different number of neutron // nucleon number.
(b) (i) Write the standard representation of element Q.
Tuliskan perwakilan piawai untuk unsur Q.
2 Q
1
(ii) State three information that can be deduced from your answer in (b)(i).
Nyatakan tiga maklumat yang boleh didapati daripada jawapan anda di (b)(i).
The proton number of element Q is 1 // Number of proton of atom Q is 1
Nucleon number of element Q is 2 // Atomic mass of atom Q is 2

Number of neutron of atom Q is 1
Nucleus of atom Q contains 1p and 1n

(c) (i) Draw atomic structure for atom of element R.
Lukiskan struktur atom bagi atom unsur R.

6 protons + 6 neutrons

(ii) Describe the atomic structure in (c)(i).
Huraikan struktur atom di (c)(i).
– The atom consists of 2 parts: the centre part called nucleus and the outer part called electron shell.
– The nucleus consists of 6 protons which are positively charged and 6 neutrons which are neutral.

– The electrons are in two shells, the first shell consists of two electrons and the second shell consists of

four electrons.
– Electrons move around nucleus in the shells.

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