Group 18 elements

What are the elements in group 18 (the far right) of the periodic table called?

• Alkali metals

• Alkaline earth metals

• Halogens

• Noble gases

Diagram shows the symbol of neon. Which statements is not true about neon?

• Neon exist as a monatomic elements

• Neon has low melting and boiling point

• Neon has a low density

• Neon reacts with bromine to form a covalent compound

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A construction worker wants to weld two pieces of iron together during the construction of a tall building. Which of the following elements, J, L, M or Q, is the most suitable to be used to provide an atmosphere which can prevent the hot iron from reacting with oxygen in the air during welding?

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Which property of Group 18 elements increases when going down the Group in the Periodic Table?

• Forces of attraction

• Reactivity

• Solubility in water

• Electrical conductivity

The symbol for helium is

• H

• He

• Hl

• Hm

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The symbol for argon is

• Ar

• Ag

• An

• A

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• The Alkali Metals = Group 1

• The Halogens = Group 17

• The Noble Gases = Group 18

• The Alkaline Earth Metals = Group 2

Helium is a good insulator. Why?

• Helium do not contains mobile ions

• Helium do not contains mobile electrons

• Helium is not inert

• Helium is light

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Why is Helium used in divers' tank but not hydrogen gas?

• Helium is lighter than hydrogen

• Helium is inert to any chemical reactions

• Helium is cheaper

• Helium is easy to get from market

Argon (proton number =18) is inert to any chemical reaction because

• It is light

• it is located in Group 18

• it has achieved stable duplet electron arrangement

• it has achieved stable octet electron arrangement

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