When $\begin{array} { c }
218\
84
\end{array}$ Po emits a beta particle,it transforms into a new element.What are the atomic number and atomic mass of this new element?
A)atomic number = 84; atomic mass = 219
B)atomic number = 86; atomic mass = 214
C)atomic number = 85; atomic mass = 218
D)atomic number = 82; atomic mass = 214

Question

When $\begin{array} { c } 
218\
84
\end{array}$ Po emits a beta particle,it transforms into a new element.What are the atomic number and atomic mass of this new element?
A)atomic number = 84; atomic mass = 219
B)atomic number = 86; atomic mass = 214
C)atomic number = 85; atomic mass = 218
D)atomic number = 82; atomic mass = 214

Quizplus · Accepted Answer

When a nucleus emits a beta particle (a high-energy electron), its atomic number increases by 1 (because a neutron in the nucleus has turned into a proton), but its atomic mass remains the same. Therefore, the new element has an atomic number of 85 and an atomic mass of 218.

When 21884\begin{array} { c } 218\\84\end{array}21884​ Po Emits a Beta Particle,it Transforms into a New Element

When $\begin{array} { c } 218\\84\end{array}$ Po Emits a Beta Particle,it Transforms into a New Element