A nuclear bomb explodes and releases Barium-140. The half life of Barium-140 is 12.8 days. A test is performed to see how much 140Ba remains 25.6 days later and it is found that there is 15 g of 140Ba remaining. a. How many half lives is this?

b. What % would remain?

c. How many g of Barium-140 was initially present when the bomb exploded?

idk what the question is about

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

i believe the answer is true.