Part A The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min?
O 0.25 mg
2.0 mg
4.0 mg
0.50 mg
O 1.0 mg
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the answer would be a

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.

c

explanation: