Chapter 4

A scientist made the following contributions in the development of the Periodic Table.

• Johan W. Dobereiner

• John Newlands

• Lothar Meyer

• Dmitri Mendeleev

Element M is placed in Group 14 and Period 3 of the Periodic Table. What is the electron arrangement of an atom M?

• 2.3

• 2.4

• 2.8.3

• 2.8.4

Table 2 shows the relative atomic masses and number of neutrons for the elements G and J. G and J are not the actual symbols of the elements.

Which of the following statements are true about these elements?

I Element G is more reactive than element J.

II Atoms G and J have two valence electrons.

III Elements G and J are in the same group in the Periodic Table.

IV Elements G and J can conduct electricity.

• I and II

• I and III

• II and IV

• III and IV

An atom Y with nucleon number of 23 has 12 neutrons. Which element has the same chemical properties as element Y?

[Proton number: B = 5, Mg = 12, Cl = 17, K = 19]

• Boron

• Magnesium

• Chlorine

• Potassium

Neon gas is used to provide an inert atmosphere for welding. Which of the following explains this property of neon?

• It has a stable electron

  arrangement

• It is placed in Group 18 of the

  Periodic Table

• It exists as monoatomic gas

• It has low melting and boiling

  points

Element G, J, and L are located in Group 17 of the Periodic Table. Atomic radius of element J is the smallest. In an experiment, when vapour L is passed over hot iron wool, the iron wool glows brightly. When vapour G is passed over hot iron wool, the iron wool glows dimly. The reactivity of elements G, J, and L in ascending order is ...

• L, G, J

• G, L, J

• G, J, L

• J, L, G

Table 3 shows the nucleon number and number of neutrons for elements W, X, Y and Z.

• W

• X

• Y

• Z

Diagram shows a Periodic Table with four elements represented by A, B, C and D. Which of these elements has an electron arrangement 2.8?

Rajah menunjukkan empat unsur yang diwakili oleh A,B,C dan D dalam Jadual Berkala. Antara unsur berikut, yang manakah mempunyai susunan elektron 2.8?

• A

• B

• C

• D

Table shows the proton number for G,J,L and M. Which of the statement is true?

Jadual menunjukkan nombor proton bagi G,J,K dan M. Manakah pernyataan yang benar?

• G and M are different groups in the Periodic Table of Elements

  G dan M berada dalam kumpulan yang berbeza dalam Jadual Berkala Unsur

• G reacts with L to form ionic compound

  G bertindak balas dengan L membentuk sebatian ion

• Solid J conducts ekectricity

  Pepejal J mengkonduksikan elektrik

• M is a diatomic molecule

  M ialah molekul dwiatom

The nucleon number of element X is 19. Element X has 10 neutrons. Which element has the same chemical properties as element X? [proton number: O=8, Na=11, Cl=17, Ar=18]

Nombor nukleon unsur X ialah 19. Unsur X mempunyai 10 neutron. Unsur yang manakah mempunyai sifat kimia yang sama dengan unsur X? [nombor proton: O=8, Na=11, Cl=17, Ar=18]

• oxygen

  oksigen

• sodium

  natrium

• chlorine

  klorin

• argon