Elements in Group 18

What are the special name given to elements in Group 18? (Multiple choose)

• Noble gases

• Inert gases

• Peace gases

• Unreactive gases

Which of the following physical properties describe Group 18 elements?

• Group 18 elements generally exists as liquid in room temperature.

• Group 18 elements generally has high melting point.

• Group 18 elements are reactive towards oxygen gas, O₂.

• Group 18 elements generally has low boiling point.

As going down Group 18, the atomic size of the atom ______.

• Increases

• Decreases

• Remain the same

Noble gases do not undergo chemical changes even though high heat energy is supplied. Which of the following best describe this statement?

• Noble gases generally exist as solid in room conditions.

• Noble gases have achieved a stable octet electron arrangement.

• Noble gases have low boiling point.

• The attractive forces between atoms is very strong.

Which of the following is not a noble gas?

• Helium, He

• Radon, Rn

• Nickel, Ni

• Xenon, Xe

Which of the following pairs are incorrect?

• Argon - used to treat cancer

• Neon - used in advertising board lights

• Helium - used to fill weather balloons

• Xenon - used for lighthouse lamps

The following shows the information about element Y.

-Achieved stable octet electron arrangement

-Used in lasers for eye retina treatment

Identify element Y.

• Helium

• Uranium

• Krypton

• Cobalt

Which of the following gases is filled in the light tube above?

• Hydrogen

• Oxygen

• Nitrogen

• Neon

Which of the following comparison is correct about helium, He and argon, Ar?

• The melting point of helium is higher than argon.

• Argon has more filled electron shells than helium.

• Helium have stable octet electron arrangement while argon have stable duplet electron arrangement.

• One mole of helium is heavier than one mole of argon.

Which of the following atomic structure belongs to Group 18?

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