Chemistry riddles

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Across
  1. 2. What do you call a negatively charged ion that sounds like a tear-jerking vegetable?
  2. 4. Why did the noble gas cry? Because all his friends ________
  3. 5. I am a lightweight gas that makes your voice squeak high and fills party balloons
Down
  1. 1. I am the foundational element for all life on Earth, found in diamonds and charcoal
  2. 3. What do you call an amusement park wheel made of iron? A ________ wheel
  3. 6. UP Why can you never trust atoms? Because they ________ ________ everything!