You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "the boiling points of the elements helium neon argon krypton?" whose answer is 121.5.
Each document should contain about 30 words, and these documents should contain useful information.

Query: boiling points of helium, neon, argon, krypton
Useful Output:

Doc 1: The boiling point of the noble gases, helium, neon, argon, krypton, xenon, radon, are the following in respective order: −268.928 °C, −246.046 °C
Doc 2: The noble gases have weak interatomic force, and consequently have very low melting and boiling points. They are all monatomic gases under
Doc 3: Helium has two electrons, neon 10, argon 18, krypton 36, xenon 54, and radon 86. And just for interest's sake, oganesson has a 118. On this basis, we can
Doc 4: The elements in group 18 are the noble gases (helium, neon, argon, krypton, xenon, and radon).  Liquid helium (boiling point, 4.2 K) is
Doc 5: noble gas ; boiling point (°C), −268.93, −246.08 ; density at 0 °C, 1 atmosphere (grams per litre), 0.17847, 0.899 ; solubility in water at 20 °C (