Mnemonics can be helpful tools for remembering information, but there aren't widely recognized or commonly used mnemonics specifically designed for remembering the elements of Period 3 of the periodic table. However, you can create your own personalized mnemonics based on the elements' symbols or properties. Here's an example of a mnemonic for the elements in Period 3:
"Silent Peter Sulfur Clips Arsenic" or "SiPeSSClAs"
Of course, you can create your own unique and memorable phrases based on the elements in Period 3 to suit your needs and help you remember them more easily.