Mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
Answer:
16.53 pounds
Explanation:
this type of problem needs convertion method we need to convert from grams to pound.
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%).
Answer:
carbon
Explanation:
because it is an allotrope of carbon