Answer
Everything will be silent
Everything will fall out of the sky
Sky will turn black
Air will be gone, if you exhaled you will pass out in a few seconds but if you hold your breath your lungs will pop and that will be a very painful death.
Eardrums would pop
Saliva would boil
If by chance you were in a pressure suit and have air then you will have a very painful sunburn and starve to death.
Rivers, lakes, and oceans would boil.
Boiling occurs whenever vapor pressure of a liquid exceeds external pressure so it is not hot.
Some bacteria could survive, so losing the atmosphere wouldn't kill all life on Earth
If you want to survive then you need to build radiation-shielded domes on the Earth's surface. It would need a pressurized atmosphere and would need to support plant life. The result would not be much different from trying to survive on another planet. Water would remain, so there would be a source of oxygen. OR you could
Build a dome under the sea. The water could provide pressure and filter out some radiation. We do not want to filter out all radiation because we need to grow plants
