Page 71 - Nilam_Publication_module_Chemistry_Form.pdf

Chemistry Form 4 • MODULE

(f) State the arrangement of elements T, U and V in the order of increasing atomic radius. Explain your answer.
Nyatakan susunan unsur T, U dan V dalam tertib pertambahan jejari atom. Terangkan jawapan anda.
V, U and T. Atoms of T, U, and V have three shells occupied with electrons.
The proton number // positive charges in the nucleus increases from T to V.

The forces of attraction between proton in the nucleus and the electrons in the shells increase from T to V.
The shells filled with electrons are pulled nearer to the nucleus from T to V.

4 The diagram below shows part of the Periodic Table of Elements. X, Y, A, B, D, E, F and G do not represent the actual
symbols.
Rajah di bawah menunjukkan sebahagian daripada Jadual Berkala Unsur. X, Y, A, B, D, E, F dan G tidak mewakili simbol yang sebenar.
X
Y

A B D E
F G

(a) (i) State the position of element B in the Periodic Table / Nyatakan kedudukan unsur B dalam Jadual Berkala.
Period 3, Group 13
(ii) Explain your answer in (a)(i) / Terangkan jawapan anda dalam (a)(i).
Electron arrangement atom B is 2.8.3. Atom B has three valence electrons, element B is in Group 13. Atom B
has three shells occupied with electrons, element B is in Period 3.
(b) (i) Which element is monatomic gas / Unsur yang manakah adalah gas monoatom?
Element Y
(ii) Explain your answer in (b)(i) / Terangkan jawapan anda dalam (b)(i).
Atom Y has achieved octet electron arrangement // has electron arrangement 2.8.
(c) Choose an element that / Pilih unsur yang:
(i) exists in the form of molecule / wujud dalam bentuk molekul X / D / E
(ii) forms acidic oxide / membentuk oksida asid D / E
(iii) has atoms that have no neutron / atom yang tiada neutron X
(iv) is an alkali metal / logam alkali A / F
(v) forms amphoteric oxide / membentuk oksida amfoterik B
(vi) has a proton number of 15 / mempunyai nombor proton 15 C
(vii) is most electropositive / paling elektropositif F
(viii) forms basic oxide / membentuk oksida bes A / F
(ix) forms coloured compound / membentuk sebatian berwarna G

(d) Arrange Y, A, B, D and E according to the order of increasing atomic size.
Susun Y, A, B, D dan E mengikut tertib pertambahan saiz atom.
Y, E, D, B, A
(e) (i) Write the electron arrangement for an atom of element / Tulis susunan elektron bagi atom unsur:
D: 2.8.5 E: 2.8.7
(ii) Compare electronegativity of elements D and E / Bandingkan keelektronegatifan unsur D dan E.
Element E is more electronegative than element D.

(iii) Explain your answer in (e)(ii) / Terangkan jawapan anda dalam (e)(ii).
Atoms E and D have the same number of shells occupied with electrons. The number of proton in the nucleus

of atom E is more than atom D. The strength of proton in nucleus to attract electrons to the outermost shells
in atom E is stronger than of atom D.

69
Nilam Publication Sdn. Bhd.

03-Chem F4 (3P).indd 69 12/9/2011 5:57:57 PM