Astatine is a halogen with several isotopes that all have short half-lives. Which of the following combinations of mass number a
nd neutrons are possible as isotopes of astatine? Choose one or more: i) A = 211, n = 127
ii) A = 210, n = 125
iii) A = 220, n = 134
iv) A = 207, n = 122
v) A = 209, n = 124
Ionization energy, also called ionization potential, in chemistry, the amount of energy required to remove an electron from an isolated atom or molecule