225/88 RA_---- 4/2 He+221/ blank Rn The missing box would be the number and this is a form of decay.
The missing box represents the number 220, and this is a form of alpha decay.
To find the missing number, we can solve the equation:
225/88 = 4/2 * (221/number)
To solve for the number, cross multiply the fractions:
225 * number = 88 * 4 * 221
Divide both sides of the equation by 88 * 4:
number = (88 * 4 * 221) / 225
Evaluating this expression gives:
number = 776
Therefore, the missing box number is 776.
As for the form of decay, based on the given information, the equation represents an alpha decay. Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, consisting of two protons and two neutrons.
To determine the missing number in the sequence "225/88 RA_---- 4/2 He+221/ blank Rn," we can analyze the pattern and properties of radioactive decay.
In the given sequence, we can recognize the notation for radioactive isotopes. The numbers on the left side of the element symbol represent the atomic mass, and the numbers on the right represent the atomic number.
The given sequence follows the decay chain of radium (Ra) to helium (He) to radon (Rn). Each decay step involves the emission of a particular particle or radiation.
Let's break down each step of the decay chain:
1. Radium (Ra): The atomic mass of radium is 225, and the atomic number is 88.
2. Helium (He): The atomic mass of helium is 4, and the atomic number is 2. This suggests that the radium isotope undergoes alpha decay, emitting an alpha particle (helium nucleus).
3. Radon (Rn): We need to determine the missing number between helium (He) and radon (Rn). To find this missing number, we consider the conservation of mass and charge during decay.
The atomic mass should decrease by 4 due to the emission of the alpha particle, which has a mass of 4. Therefore, the atomic mass of the missing element is 4.
The atomic number should decrease by 2 as the alpha particle carries a charge of +2. Therefore, the atomic number of the missing element is 2.
So, the missing number in the sequence is "4/2," representing an atomic mass of 4 and an atomic number of 2.
This type of decay is known as alpha decay.