Introduction To The Atom

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Introduction To The Atom - Quiz


Questions and Answers
  • 1. 

    In the original Greek, the word "atom" means

    • A.

      Uncuttable

    • B.

      Rotational

    • C.

      Systematic

    • D.

      Origin

    Correct Answer
    A. Uncuttable
    Explanation
    The word "atom" originates from the original Greek term meaning "uncuttable." This suggests that the concept of an atom was initially believed to be the smallest, indivisible unit of matter. The term "uncuttable" implies that atoms cannot be further divided or broken down into smaller components. This understanding of atoms as fundamental building blocks of matter forms the basis of atomic theory in chemistry and physics.

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  • 2. 

    The positively-charged subatomic particle is a

    • A.

      Neutron

    • B.

      Graviton

    • C.

      Proton

    • D.

      Electron

    Correct Answer
    C. Proton
    Explanation
    A positively-charged subatomic particle refers to a particle that carries a positive charge. Among the given options, the only particle that fits this description is the proton. Protons are found in the nucleus of an atom and have a positive charge. Neutrons have no charge, electrons have a negative charge, and gravitons are theoretical particles that have not been observed. Therefore, the correct answer is proton.

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  • 3. 

    An electron is a

    • A.

      Negatively-charged subatomic particle

    • B.

      Semiconductor electrical substrate

    • C.

      Packet of light energy emitted by atoms

    • D.

      Electroweak interaction with material forces

    Correct Answer
    A. Negatively-charged subatomic particle
    Explanation
    An electron is a negatively-charged subatomic particle. This means that it carries a negative charge and is one of the fundamental particles that make up atoms. Electrons orbit around the nucleus of an atom and are involved in various chemical and electrical interactions. They play a crucial role in determining the properties and behavior of matter.

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  • 4. 

    You can not know both an electron's ___________ and ____________ at any point in time.

    • A.

      Size, shape

    • B.

      Location, momentum

    • C.

      Spin, vibration

    • D.

      Charge, velocity

    Correct Answer
    B. Location, momentum
    Explanation
    According to the Heisenberg uncertainty principle, it is impossible to simultaneously know the exact position (location) and momentum of an electron. This principle states that the more precisely one property is known, the less precisely the other can be known. Therefore, it is not possible to determine both the location and momentum of an electron at any given point in time.

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  • 5. 

    What is an orbital?

    • A.

      Quantum mechanic shifts an electron makes when an atom absorbs energy

    • B.

      Chemical reaction between an electron and a proton

    • C.

      Spinning path the electron particle makes around the nucleus

    • D.

      Mathematical probability function of where an electron is likely to be

    Correct Answer
    D. Mathematical probability function of where an electron is likely to be
    Explanation
    An orbital refers to a mathematical probability function that describes the likelihood of finding an electron in a particular region around the nucleus of an atom. It does not represent the actual path or trajectory of the electron, but rather the probability of locating the electron in a specific space. This concept is a fundamental aspect of quantum mechanics and helps to understand the behavior and properties of atoms and molecules.

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  • 6. 

    One atomic mass unit equals

    • A.

      The mass of an atom in a vacuum at zero degrees kelvin

    • B.

      The mass of 1 proton or 1 neutron

    • C.

      A unit to compare relative atomic masses

    • D.

      The weight of an atom in a vacuum

    Correct Answer
    B. The mass of 1 proton or 1 neutron
    Explanation
    One atomic mass unit equals the mass of 1 proton or 1 neutron. Protons and neutrons are the subatomic particles found in the nucleus of an atom. They have approximately the same mass, which is why one atomic mass unit is defined as the mass of either a proton or a neutron. This unit is used to compare the masses of different atoms and is essential in understanding the concept of relative atomic masses.

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  • 7. 

    What is the negatively-charged subatomic particle?

    • A.

      Neutron

    • B.

      Graviton

    • C.

      Proton

    • D.

      Electron

    Correct Answer
    D. Electron
    Explanation
    The negatively-charged subatomic particle is the electron. Electrons are found in the electron cloud surrounding the nucleus of an atom and they carry a negative charge. They are one of the fundamental particles that make up atoms and play a crucial role in chemical reactions and electrical conductivity.

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  • 8. 

    What is the uncharged subatomic particle?

    • A.

      Neutron

    • B.

      Graviton

    • C.

      Proton

    • D.

      Electron

    Correct Answer
    A. Neutron
    Explanation
    A neutron is an uncharged subatomic particle found in the nucleus of an atom. Unlike protons and electrons, which carry positive and negative charges respectively, neutrons have no electrical charge. This makes them neutral and allows them to play a crucial role in stabilizing the nucleus of an atom. Neutrons are responsible for holding the protons together through the strong nuclear force, preventing them from repelling each other due to their positive charges. Therefore, the correct answer for the uncharged subatomic particle is neutron.

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  • 9. 

    An electron gains potential energy as it

    • A.

      Accumulates charge in response to the protons in the nucleus

    • B.

      Moves away from the nucleus

    • C.

      Interacts with gravitational fields

    • D.

      Increases its radioactive decay

    Correct Answer
    B. Moves away from the nucleus
    Explanation
    As an electron moves away from the nucleus, it gains potential energy. This is because the electron and the positively charged protons in the nucleus are attracted to each other by the electromagnetic force. As the distance between the electron and the nucleus increases, the force of attraction decreases, resulting in an increase in potential energy for the electron. Therefore, the correct answer is that an electron gains potential energy as it moves away from the nucleus.

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  • 10. 

    I know what element an atom is by the

    • A.

      Number of protons in the nucleus

    • B.

      Atomic radius, in angstroms

    • C.

      Number of neutrons in the nucleus

    • D.

      String vibrations the atom emits when excited

    Correct Answer
    A. Number of protons in the nucleus
    Explanation
    The number of protons in the nucleus of an atom determines the element it is. This is because each element has a unique number of protons, known as its atomic number. The atomic number defines the identity of the element and determines its chemical properties. Therefore, by knowing the number of protons in the nucleus, one can identify the element to which the atom belongs.

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  • 11. 

    An element's atomic number is

    • A.

      The quantity of subatomic particles in the nucleus

    • B.

      The number of protons

    • C.

      The number of electrons

    • D.

      The number of electron orbitals surrounding a nucleus

    Correct Answer
    B. The number of protons
    Explanation
    An element's atomic number is the number of protons in its nucleus. Protons are positively charged subatomic particles found in the nucleus of an atom. The atomic number determines the identity of the element and its position in the periodic table. It also determines the number of electrons in a neutral atom, as in a neutral atom the number of protons is equal to the number of electrons. Therefore, the correct answer is the number of protons.

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  • 12. 

    An atom has a neutral charge if

    • A.

      The nucleus consists of neutrons

    • B.

      Protons repel electrons because they have different charges

    • C.

      Quantized spin dynamics alter orbital strengths

    • D.

      The number of protons equals the number of electrons

    Correct Answer
    D. The number of protons equals the number of electrons
    Explanation
    An atom has a neutral charge when the number of protons, which carry a positive charge, is equal to the number of electrons, which carry a negative charge. This balance of positive and negative charges cancels out, resulting in a neutral overall charge for the atom.

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  • 13. 

    The mass of one proton equals the masses of about

    • A.

      20 neutrons

    • B.

      2,000 electrons

    • C.

      20,000 electrons

    • D.

      100,000 neutrons

    Correct Answer
    B. 2,000 electrons
    Explanation
    The mass of one proton is much larger than the mass of one electron. Therefore, in order for the mass of one proton to equal the mass of 2,000 electrons, each electron would have to be significantly smaller in mass compared to a proton. This explanation is consistent with the given answer choice.

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  • 14. 

    The atomic weight of an element is the

    • A.

      Weighted mass of the most common isotope of that element

    • B.

      Weighted average of the masses of naturally-occurring isotopes

    • C.

      Largest weight of an isotope of that element

    • D.

      Relative weight percent of one atom to others in a compound

    Correct Answer
    B. Weighted average of the masses of naturally-occurring isotopes
    Explanation
    The atomic weight of an element is the weighted average of the masses of naturally-occurring isotopes. This means that it takes into account the abundance of each isotope in nature and calculates a weighted average based on those abundances. Isotopes with higher abundances contribute more to the overall atomic weight, while isotopes with lower abundances have less impact. This is important because it reflects the actual distribution of isotopes in nature and provides a more accurate representation of the element's atomic weight.

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  • 15. 

    Isotopes are

    • A.

      Chemical compounds with the same states of electrons

    • B.

      Atoms with the same number of neutrons but a different number of protons

    • C.

      Atoms with the same number of protons but a different number of neutrons

    • D.

      Chemical compounds with distinct electron orbitals

    Correct Answer
    C. Atoms with the same number of protons but a different number of neutrons
    Explanation
    Isotopes are atoms with the same number of protons but a different number of neutrons. This means that isotopes have the same atomic number (which is determined by the number of protons) but different atomic masses (which is determined by the number of protons and neutrons combined). Isotopes of an element have similar chemical properties since they have the same number of protons and electrons, but they may have different physical properties due to their different atomic masses.

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  • 16. 

    What percent of matter is made of free space, at an atomic level?

    • A.

      67.33%

    • B.

      0.01%

    • C.

      99.99%

    • D.

      23.67%

    Correct Answer
    C. 99.99%
    Explanation
    At an atomic level, matter is mostly made up of empty space. This is because atoms consist of a nucleus surrounded by electrons, and the size of the nucleus is much smaller compared to the space occupied by the electrons. Therefore, almost all of the space within an atom is empty. The correct answer, 99.99%, reflects this fact and indicates that only a tiny fraction of matter is actually occupied by particles, while the majority is empty space.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 06, 2011
    Quiz Created by
    Khanacademy
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