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Attempts 127

Which element has the lowest melting point and boiling point of all?

  1. A
    Carbon
  2. B
    Helium
  3. C
    Neon
  4. D
    Oxygen

Topic Flashcards

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Question

Why does helium have the lowest boiling point of any element?

Answer

Its atoms are the smallest and have the weakest intermolecular forces (London dispersion forces), requiring very little energy to separate.

Question

What is the general trend in boiling points among the noble gases (Group 18), and where does helium fit?

Answer

Boiling points increase down the group as atomic size and intermolecular forces increase. Helium, at the top, has the lowest boiling point.

Question

Under standard atmospheric pressure, can helium form a solid? What special condition is required?

Answer

No, it remains liquid down to near absolute zero. To solidify helium, extreme pressure must be applied in addition to very low temperature.

Question

Compare hydrogen (H₂) and helium (He). Why does helium have a lower boiling point even though hydrogen is lighter?

Answer

Hydrogen molecules have stronger intermolecular forces (dipole interactions and larger electron clouds) than helium’s extremely weak London forces, giving helium a lower boiling point.

Question

What property of an element’s atoms most directly determines the strength of its London dispersion forces and, consequently, its melting/boiling point?

Answer

The size of the electron cloud (or atomic/molecular size). Larger electron clouds are more polarizable, leading to stronger temporary dipoles and higher phase-change temperatures.

Question

Is the element with the lowest boiling point located in Group 1 of the periodic table?

Answer

No

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