Phosphorus-32 (radioactive) has __________ than phosphorus-35 (normal).

The isotope Carbon-14 has a half-life of 5,730 years. How many years must pass for a sample of Carbon-14 to break down to ¼ of its original amount?

a) 5,730 years 

b) 17,190

c) 11,460

d) 2,865

Fill in the blanks: Isotopes are atoms with the same ______number but different______numbers.

In certain types of radioactive decay, the isotope releases a particle called an alpha particle, which contains two protons and two neutrons. When this happens, is the product still the same element? Why or why not?