I periodically see my doctor and our conversations go like this...

Doc: your diet isn't great. Don't you think you should try to easy off on the salt?

Me: Na

Doc: you really should. You might develop respiratory issues and have trouble breathing.

Me: O

Doc: and try eating more fruits. They'll give you more vitamins and minerals

Me...

How often are chemistry jokes posted to reddit?

Periodically

I used to date a periodicals librarian…

…but we broke up because she had too many issues.

My favorite elements in the periodical chart are oxygen and potassium.

But most other people just find them O K.

I slept like a baby last night.

I woke up periodically, screaming in terror and confusion.

How often do scientists check the table of elements?

Periodically

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