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What is the Artificial Transmutation of Elements?
Grade Level:
Class 12
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Definition
What is it?
Artificial Transmutation of Elements is the process where one chemical element is changed into another element by human-made methods. This happens by altering the nucleus of an atom, usually by bombarding it with high-energy particles like neutrons or alpha particles.
Simple Example
Quick Example
Imagine you have a simple building block toy set, and you want to make a different toy. Instead of just rearranging the blocks, you actually change the type of block itself – maybe a red square block becomes a blue round block. In chemistry, artificial transmutation is like changing one type of atom (one 'building block') into a completely different type of atom.
Worked Example
Step-by-Step
Let's see how Nitrogen (N) can be changed into Oxygen (O) artificially, which was one of the first successful transmutations by Rutherford.
1. **Start with the original element:** We begin with Nitrogen-14 (14N), which has 7 protons and 7 neutrons.
2. **Bombard with alpha particles:** We hit the Nitrogen-14 nucleus with high-energy alpha particles. An alpha particle is essentially a Helium nucleus (4He), containing 2 protons and 2 neutrons.
3. **Nuclear reaction occurs:** When the alpha particle hits the Nitrogen nucleus, they combine temporarily, forming an unstable intermediate nucleus.
4. **Eject a proton:** This unstable nucleus then quickly ejects a proton (1H). A proton has 1 proton and 0 neutrons.
5. **Calculate the new element:**
* Initial protons: 7 (from N) + 2 (from alpha) = 9 protons.
* Protons ejected: 1 (from proton).
* Final protons: 9 - 1 = 8 protons. An atom with 8 protons is Oxygen.
6. **Calculate the new mass number:**
* Initial mass number: 14 (from N) + 4 (from alpha) = 18.
* Mass number ejected: 1 (from proton).
* Final mass number: 18 - 1 = 17. So, the new element is Oxygen-17 (17O).
ANSWER: Nitrogen-14 is artificially transmuted into Oxygen-17 and a proton is released.
Why It Matters
This process is crucial for creating new elements not found naturally and producing isotopes used in various fields. Scientists use this for medical treatments like cancer therapy, generating energy in nuclear power plants, and developing advanced materials for space technology. Careers in nuclear physics, medicine, and materials science rely on understanding this concept.
Common Mistakes
MISTAKE: Thinking transmutation is just changing the number of electrons or rearranging atoms in a molecule. | CORRECTION: Transmutation specifically involves changing the nucleus of an atom, which means changing the number of protons and thus the element itself.
MISTAKE: Believing artificial transmutation happens easily with everyday chemicals. | CORRECTION: It requires extremely high energy and specialized equipment, like particle accelerators, to overcome the strong forces within the nucleus.
MISTAKE: Confusing artificial transmutation with natural radioactivity. | CORRECTION: Natural radioactivity is a spontaneous decay of unstable nuclei, while artificial transmutation is a human-initiated process using external bombardment.
Practice Questions
Try It Yourself
QUESTION: If an atom of Boron-10 (5 protons, 5 neutrons) is bombarded with a neutron and then emits an alpha particle, what new element is formed? | ANSWER: Lithium-7 (3 protons, 4 neutrons)
QUESTION: Uranium-238 is bombarded with a neutron, forming Uranium-239. This Uranium-239 then undergoes two consecutive beta decays. What is the final element formed? (Hint: Beta decay converts a neutron into a proton). | ANSWER: Plutonium-239
QUESTION: A new artificial element X is created by bombarding an unknown target element Y with alpha particles. If element X has an atomic number of 104 and a mass number of 260, and two neutrons were emitted during the reaction, what was the target element Y? | ANSWER: Californium-254 (atomic number 98)
MCQ
Quick Quiz
What is the primary change that occurs during artificial transmutation of elements?
Change in the number of electrons
Change in the chemical bonds between atoms
Change in the nucleus, leading to a new number of protons
Change in the physical state of the element
The Correct Answer Is:
C
Artificial transmutation fundamentally changes the number of protons in an atom's nucleus, which defines the element. Options A, B, and D describe chemical or physical changes, not transmutation.
Real World Connection
In the Real World
In India, artificial transmutation is vital in Bhabha Atomic Research Centre (BARC) for producing radioisotopes like Cobalt-60 or Iodine-131. These isotopes are then used in hospitals across the country for treating cancer patients through radiation therapy or for diagnostic imaging, helping doctors save lives.
Key Vocabulary
Key Terms
NUCLEUS: The central part of an atom containing protons and neutrons | PROTON: A positively charged particle in the nucleus that determines the element | NEUTRON: A neutral particle in the nucleus that contributes to mass | ALPHA PARTICLE: A particle consisting of two protons and two neutrons, identical to a Helium nucleus | ISOTOPE: Atoms of the same element with different numbers of neutrons
What's Next
What to Learn Next
Next, you can explore 'Radioactivity and Nuclear Fission.' Understanding artificial transmutation will help you grasp how nuclear fission releases massive amounts of energy and is used in nuclear power plants, a truly powerful application of changing elements!
