Helium walks into a bar. The bartender says "We don't serve noble gasses in here." Helium doesn't react.

 2282

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Two chemists go into a restaurant. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" - and he died.

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Q: What is the show cesium and iodine love watching together? A: CSI

 789

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Q: Did you hear oxygen went on a date with potassium? A: It went OK.

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Q: What did the scientist say when he found 2 isotopes of helium? A: HeHe

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