Chapter 8: Main Group Elements

Which of the following correct for members in Group 18.

• H, Ne, Kr, Ar, Rn, Xe

• He, Ne, Rn, Kr, Ar, Xe

• He, Na, Rn, K, Ar, Xe

• H, Ne, Rb, Kr, Ar, Xe

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As going down Group 18, melting point

• Increase

• Decrease

Elements in Group 18 exist in nature as a

• Solid

• Liquid

• Gas

Group 18 elements are chemically inert because

• They achieved stable electron octet arrangement

• It will not accept, donate or share electron

• It is monoatomic in nature

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Which of the followings is incorrect on physical property as going down Group 17

• Melting & boiling point increase

• Density increase

• Colour becomes lighter

• State of matter change from gas to liquid to solid

Which statements is correct about the alkali metals when going down Group 1 in the Periodic Table?

• The reactivity decreases

• Strength of nucleus to attract an electron into the valence shell increases

• Electropositivity decreases

• The single valence electron becomes more weakly pulled by the nucleus

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Group 1 elements are also known as

• Noble gas

• Halogen

• Alkaline earth metals

• Alkali metals

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Group 1 elements only form ….. Ion

• 1+

• 1-

• 2+

• 2-

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What gas is given off when group 1 elements reacts with water?

• Hydrogen

• Oxygen

• Carbon dioxide

• Helium

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Why does the reactivity of group 1 elements increases down the group?

• It becomes more reactive

• It becomes easier to accept an electron

• It becomes easier to lose an electron

• It becomes less reactive

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