Figure 25-18 shows the steps by which ^23592 ∪decays to ^20782 Pb. Draw this diagram, and enter

Figure 25-18 shows the steps by which ^23592 ∪decays to...

Key Concepts

Beta Decay

Beta decay is the process in which a nucleus emits a beta particle (electron or positron) as a result of the transformation of a neutron into a proton or vice versa. This decay alters the atomic number by one without significantly changing the mass number, often occurring when the nucleus has an imbalance in its proton-to-neutron ratio.

Radioactive Decay

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation. This decay can occur via several modes such as alpha, beta, or gamma decay, transforming the nucleus into a more stable state. It is a spontaneous process governed by the principles of quantum mechanics and results in the alteration of the nucleus’s composition.

Alpha Decay

Alpha decay is a type of radioactive decay in which an unstable nucleus emits an alpha particle, which consists of two protons and two neutrons. This emission reduces the atomic number by two and the mass number by four, leading to the formation of a new element. It is a common decay mode for heavy nuclei seeking greater stability.

Decay Chain

A decay chain is a series of successive radioactive decays that a parent radionuclide undergoes before reaching a stable daughter nucleus. Each step in the chain is characterized by a specific decay process (such as alpha or beta decay), and understanding these chains is fundamental to studying the long-term behavior of radioactive materials.

Isotope Notation

Isotope notation is a standardized way of representing an element’s isotope using its mass number and atomic number. Typically formatted as A/Z Element, where A is the mass number and Z is the atomic number, this notation provides a concise method for conveying information about the nucleus and its particles.

Transcript

00:01 Over here in this question, we want to actually identify the different intermediate products of uranium 235 as it decays down to its most stable, most stable daughter nucleic, which is the lead 207.

00:18 So it undergoes a series of alpha and electron decay.

00:25 So this graph is drawn in this diagram because for any box that is adjacent to it, right, that it corresponds to a certain decay mode, right? so if it's adjacent below the box, it actually undergoes a beta decay, right? simply emitting an electron during the decay but if it is to the right of the box then it means that it has emitted an alpha particle during its decay so to identify the different unknown particles what we can do to infer is we know that alpha particle is made up of four nucleons and two protons.

01:31 So for any particle or any daughter nucleid to the right of a box, its nuclear number or mess number must be less by four right to the to the nucleic that is on the left.

01:49 Same for the proton number it must be two less than the proton number of the particle on is left.

01:57 On the other hand for the positron, sorry for the electron decay or beta decay, we know that when the other goes say beta decay it is simply a conversion from nitrogen sorry from neutron into a proton and an electron.

02:19 So the neutron will decrease by one but proton will increase by one.

02:26 So the proton number, will increase but the nucleon number in total will not change because even though the neutron decreased by one the proton increased so the total nucleon number is to the same only the proton number will be increased so we can just use that very simply to identify the different elements so we start off at the first uranium right on on its right it would have reduced the nuclear number by 4, so 2, 31, then the proton will have reduced by 2.

03:09 So this would be 231 and 90.

03:12 So we have to look up the periodic table to find what element it is, and it is the storium.

03:22 We're going to repeat this process.

03:25 When we move down, remember the proton number will increase.

03:32 But the nuclear number remains the same.

03:35 Right and this is the element.

03:42 Moving to the right, nuclear number decreased by 4, proton number decreased by 2.

03:56 So the element is here is this element...

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