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MODULE • Chemistry Form 4

– The number of proton in the nucleus of atom Y is more than X.
– The strength nuclei attraction to the electrons in the shells of atom Y is stronger than X.

(b) How are X ion and Y ion formed from their respective atoms?
Bagaimana ion X dan ion Y terbentuk daripada atom masing-masing?
X ion / Ion X : Atom X releases one electron

Y ion / Ion Y : Atom Y receives one electron
(c) (i) Write the formula for compound A / Tuliskan formula sebatian A.
XY
(ii) Name type of bond in compound A / Namakan jenis ikatan dalam sebatian A.
Ionic compound

(iii) Write the chemical equation for the reaction between element X and element Y to form compound A.
Tuliskan persamaan kimia untuk tindak balas antara unsur X dan unsur Y untuk membentuk sebatian A.
2X + Y 2XY .
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(d) Y can react with carbon to form a compound. Draw the electron arrangement for the compound formed.
[Given that proton number for carbon is 6]
Y bertindak balas dengan karbon untuk membentuk suatu sebatian. Lukiskan susunan elektron bagi sebatian yang terbentuk.
[Diberi nombor proton karbon ialah 6]

3 The table below shows the nucleon number, the number of neutrons and number of electrons in particles X, Y, Z, Q, R, T
and U.
Jadual di bawah menunjukkan nombor nukleon, bilangan neutron dan bilangan elektron bagi zarah X, Y, Z, Q, R, T dan U.

Particles / Zarah X Y Z Q R T U
Nucleon number / Nombor nukleon 20 24 23 16 12 27 35
Number of proton / Bilangan proton 10 12 11 8 6 13 17
Number of neutron / Bilangan neutron 10 12 12 8 6 14 18
Number of electron / Bilangan elektron 10 10 11 10 6 10 17
(a) What is meant by nucleon number / Apakah maksud nombor nukleon?
The total number of proton and neutron in the nucleus of an atom.

(b) Complete the number of proton of the particles in the table above.
Lengkapkan bilangan proton bagi zarah dalam jadual di atas.
(c) State a particle which is / Nyatakan zarah yang merupakan
(i) an atom of a non-metal / atom bukan logam X / R
(ii) an atom of a metal / atom logam Z
Y / T
(iii) a positive ion / ion positif
Q
(iv) a negative ion / ion negatif
(v) a positive ion with charge 3+ / ion positif dengan cas 3+ T
X
(vi) an atom of a noble gas / atom gas adi
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