When radium -226 (atomic number 88) decays by emitting an alpha particle, it becomes _____.
a. polonium-222
b. polonium-224
c. radium-222
d. radon-222
Answer: D
When radium -226 (atomic number 88) decays by emitting an alpha particle, it becomes _____.
a. polonium-222
b. polonium-224
c. radium-222
d. radon-222
Answer: D