To find out the pressure in atm. You must divide 385 by 760. So pressure in atmospheres equals 385/760.
The best answer is the isotope of strontium which is strontium-85. It has a half-life of about 64 days. The metal strontioum has four stable, naturally occurring isotopes which includes 84Sr (0.56%), 86Sr (9.86%), 87Sr (7.0%) and 88Sr (82.58%).
There is 3 ways that an atom can be put together