G12 T3 Classwork 1

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    A radioactive nucleus contains 138 neutrons. The nucleus emits an α-particle.How many neutrons are in the nucleus after it has emitted the α-particle? 

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About This Quiz

G12 T3 Classwork 1 focuses on understanding radioactivity, including the nature of beta and alpha particles, and their effects on atomic structure. This quiz assesses knowledge of nuclear physics, enhancing students' comprehension of atomic changes during radioactive emissions.

G12 T3 Classwork 1 - Quiz

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  • 2. 
    How many protons are there in a neutral atom of  - ProProfs

    How many protons are there in a neutral atom of 

  • 3. 

    A powder contains 400mg of a radioactive material that emits α-particles.The half-life of the material is 5 days. What mass of that material remains after 10 days? 

    Explanation
    The half-life of a radioactive material is the time it takes for half of the material to decay. In this case, the half-life is 5 days. After 5 days, half of the material will have decayed, leaving 200mg remaining. After another 5 days (10 days total), another half of the remaining material will have decayed, leaving 100mg remaining. Therefore, the mass of the material that remains after 10 days is 100mg.

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  • 4. 

    A radioactive nucleus contains 138 nucleons. The nucleus emits an α-particle.How many nucleons are in the nucleus after it has emitted the α-particle? 

    Explanation
    When a radioactive nucleus emits an α-particle, it loses 2 protons and 2 neutrons. Since the nucleus initially contains 138 nucleons, after emitting the α-particle, it will have 136 nucleons remaining. Therefore, the correct answer is 134 nucleons.

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  • 5. 
    How many electrons are in a nucleus of  if the atom is neutral? - ProProfs

    How many electrons are in a nucleus of  if the atom is neutral?

    Explanation
    The number of electrons in an atom's nucleus is always zero. Electrons are negatively charged particles that orbit the nucleus in specific energy levels. The nucleus, on the other hand, contains positively charged protons and usually neutral neutrons. Therefore, the statement that there are 19 electrons in the nucleus is incorrect.

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  • 6. 
    An atom of the element lithium has a nucleon number of 7 and a proton number of 3.Which diagram represents a neutral atom of lithium?  - ProProfs

    An atom of the element lithium has a nucleon number of 7 and a proton number of 3.Which diagram represents a neutral atom of lithium? 

    • Diagram A

    • Diagram B

    • Diagram C

    • Diagram D

    Correct Answer
    A. Diagram C
    Explanation
    Diagram C represents a neutral atom of lithium because it shows 3 protons in the nucleus, which is consistent with the proton number of 3 for lithium. It also shows 4 neutrons in the nucleus, which gives a total nucleon number of 7, as stated in the question. The diagram also shows 3 electrons orbiting the nucleus, which balances out the positive charge of the protons, making the atom neutral.

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  • 7. 
    The diagram shows the paths of three different types of radiation, X, Y and Z. - ProProfs

    The diagram shows the paths of three different types of radiation, X, Y and Z.

    • A

    • B

    • C

    • D

    Correct Answer
    A. B
    Explanation
    The explanation for the correct answer B is not available.

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  • 8. 

    What is a β-particle and from which part of a radioactive atom is it emitted?

    • Electron from the nucleus

    • Electron from outer orbits

    • Helium nucleus from the nucleus

    • Helium nucleus from outer orbits

    Correct Answer
    A. Electron from the nucleus
    Explanation
    A β-particle is an electron that is emitted from the nucleus of a radioactive atom. It is not emitted from the outer orbits of the atom.

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  • 9. 

    Which type of radiation has the greatest ionising effect?

    • α-particles

    • β-particles

    • γ-rays

    • All have the same ionising effect

    Correct Answer
    A. α-particles
    Explanation
    Alpha particles have the greatest ionizing effect among the given options. This is because alpha particles are large and heavy, consisting of two protons and two neutrons. They have a positive charge and high kinetic energy, allowing them to collide with atoms and remove electrons, causing ionization. Beta particles, on the other hand, are smaller and lighter, consisting of high-energy electrons or positrons. Gamma rays are electromagnetic waves with no mass or charge. While all types of radiation can cause ionization, alpha particles are more effective due to their size and charge.

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  • Mar 18, 2023
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  • Apr 14, 2015
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    Frank3F
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