question 11 (3 points)\n218 84 po → 0 -1 e⁻ + \nword bank:\n218 bi at 85 83 219\nblank 1:\nblank 2:\nblank 3:
question 11 (3 points)\n218 84 po → 0 -1 e⁻ + \nword bank:\n218 bi at 85 83 219\nblank 1:\nblank 2:\nblank 3:
Answer
Explanation:
Step1: Balance mass - number
In a nuclear - decay equation, the sum of mass - numbers on the left side must equal the sum of mass - numbers on the right side. The mass - number of $^{218}{84}Po$ is 218 and the mass - number of the electron $^{0}{ - 1}e$ is 0. So the mass - number of the daughter nucleus is 218.
Step2: Balance atomic - number
The sum of atomic numbers on the left side must equal the sum of atomic numbers on the right side. The atomic number of $^{218}{84}Po$ is 84 and the atomic number of the electron $^{0}{ - 1}e$ is - 1. Let the atomic number of the daughter nucleus be $Z$. Then $84= - 1+Z$, so $Z = 85$.
Step3: Identify the element
The element with atomic number 85 is astatine, symbol At.
Answer:
Blank 1: 218 Blank 2: At Blank 3: 85